Browse free open source Linters and projects for Mac below. Use the toggles on the left to filter open source Linters by OS, license, language, programming language, and project status.

  • Papirfly: Best user-friendly DAM and Content Creation Software Icon
    Papirfly: Best user-friendly DAM and Content Creation Software

    The #1 solution to create and manage content. On‑brand. At scale.

    Papirfly provides a single online destination for all your employees and other stakeholders who are engaging with your brand, ensuring consistency in all aspects of their communications. Teams can produce infinite studio-standard marketing materials from bespoke templates, store, share and adapt them for their own markets and stay firmly educated on the brand’s purpose, guidelines and evolution – with no specialist skills or agency help necessary.
    Learn More
  • Rev Your Digital Product Delivery Engine Icon
    Rev Your Digital Product Delivery Engine

    Enterprise-grade platform designed to connect strategy, planning, and execution across digital product development and software delivery

    Planview links your technology vision directly to teams' daily work, providing complete visibility and control over your digital product delivery ecosystem.
    Learn More
  • 1
    Ruff

    Ruff

    An extremely fast Python linter, written in Rust

    An extremely fast Python linter, written in Rust. Ruff aims to be orders of magnitude faster than alternative tools while integrating more functionality behind a single, common interface. Ruff can be used to replace Flake8 (plus dozens of plugins), isort, pydocstyle, yesqa, eradicate, pyupgrade, and autoflake, all while executing tens or hundreds of times faster than any individual tool. Ruff is extremely actively developed and used in major open-source projects. Ruff can be configured through a pyproject.toml, ruff.toml, or .ruff.toml file (see: Configuration, or Settings for a complete list of all configuration options). Ruff supports over 500 lint rules, many of which are inspired by popular tools like Flake8, isort, pyupgrade, and others. Regardless of the rule's origin, Ruff re-implements every rule in Rust as a first-party feature.
    Downloads: 53 This Week
    Last Update:
    See Project
  • 2
    ESLint

    ESLint

    The pluggable linting utility for identifying patterns in Javascript

    ESLint is an open source tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. ESLint is written using Node.js
    Downloads: 7 This Week
    Last Update:
    See Project
  • 3
    eslint-config

    eslint-config

    Anthony's ESLint config presets

    Anthony's ESLint config presets. Auto fix for formatting (aimed to be used standalone without Prettier). Designed to work with TypeScript, Vue out-of-box. Lint also for json, yaml, markdown. Sorted imports, dangling commas for cleaner commit diff. Reasonable defaults, best practices, only one-line of config.
    Downloads: 6 This Week
    Last Update:
    See Project
  • 4
    Jsonnet

    Jsonnet

    Jsonnet, the data templating language

    A data templating language for app and tool developers. Eliminate duplication with object-orientation or use functions. Integrate with existing / custom applications. Generate JSON, YAML, INI, and other formats. The name Jsonnet is a portmanteau of JSON and sonnet, pronounced "jay sonnet". It began life early 2014 as a 20% project and was launched on Aug 6. The design is influenced by several configuration languages internal to Google, and embodies years of experience configuring some of the world's most complex IT systems. Jsonnet is now used by many companies and projects. Jsonnet is not an official Google product (experimental or otherwise), it is just code that happens to be owned by Google. Jsonnet is open source (Apache 2.0), familiar syntax, reformatter, linter, editor & IDE integrations, and formally specified.
    Downloads: 5 This Week
    Last Update:
    See Project
  • Time tracking software for the global workforce Icon
    Time tracking software for the global workforce

    Teams of all sizes and in various industries that want the best time tracking and employee monitoring solution.

    It's easy with Hubstaff, a time-tracking and workforce management platform that automates almost every aspect of running or growing a business. Teams can track time to projects and to-dos using Hubstaff's desktop, web, or mobile applications. You'll be able to see how much time your team spends on different tasks, plus productivity metrics like activity rates and app usage through Hubstaff's online dashboard. Most of the available features are customizable on a per-user basis, so you can create the team management tool you need.
    Learn More
  • 5
    Ultracite

    Ultracite

    A highly opinionated, zero-configuration linter and formatter

    Ultracite is a highly opinionated, zero-configuration linting and formatting preset designed primarily for modern JavaScript/TypeScript codebases. It is built on top of the Biome toolchain (written in Rust) and aims to deliver sub-second performance so that formatting and linting feel seamless, even on large projects. Because it comes pre-configured with sensible defaults for frameworks like React and Next.js, developers can adopt it with minimal setup—simply run npx ultracite init and start coding. The project emphasizes type-safety and best practices, enforcing stricter rules out of the box so that unsafe or sloppy patterns are discouraged. It also positions itself as “AI-ready,” meaning it’s designed to integrate smoothly into workflows where AI code generation (e.g., from Copilot, Claude Code, etc) is involved, ensuring consistent style across team-written and machine-written code.
    Downloads: 5 This Week
    Last Update:
    See Project
  • 6
    golangci-lint

    golangci-lint

    Fast linters Runner for Go

    golangci-lint is a fast Go linters runner. It runs linters in parallel, uses caching, supports yaml config, has integrations with all major IDE and has dozens of linters included. ⚡ Very fast: runs linters in parallel, reuses Go build cache and caches analysis results. Yaml-based configuration. Integrations with VS Code, Sublime Text, GoLand, GNU Emacs, Vim, Atom, GitHub Actions. A lot of linters included, no need to install them. Minimum number of false positives because of tuned default settings. Nice output with colors, source code lines and marked identifiers.
    Downloads: 4 This Week
    Last Update:
    See Project
  • 7
    go-critic

    go-critic

    The most opinionated Go source code linter for code audit

    The most opinionated Go source code linter. go-critic is a collection of checks that detect style, and performance issues as well as some common programming errors. We provide as many useful checks as possible. We’re prototyping and experimenting here. When specific check implementation is mature and proven useful, propose it’s integration into other linter. If a good checker can’t find a better home, it stays here. Almost 100 diagnostics that check for bugs, performance and style issues. Extensible without re-compilation with dynamic rules. Includes #opinionated checks with very strict and specific requirements. Self-documented: gocritic doc <checkname> gives a checker description. Usage of gocritic: gocritic [sub-command] [sub-command args...] Run gocritic without arguments to get help output.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 8
    Clj-kondo

    Clj-kondo

    A linter for Clojure code that sparks joy

    A linter for Clojure code that sparks joy. Clj-kondo performs static analysis on Clojure, ClojureScript and EDN, without the need of a running REPL. It informs you about potential errors while you are typing. To detect lint errors across namespaces in your project, a cache is needed. To let clj-kondo know where to create one, make a .clj-kondo directory in the root of your project, meaning on the same level as your project.clj, deps.edn or build.boot. A cache will be created inside of it when you run clj-kondo. Before linting inside your editor, it is recommended to lint the entire classpath to teach clj-kondo about all the libraries you are using, including Clojure and/or ClojureScript itself. Since clj-kondo now knows about your version of ClojureScript via the cache, it detects that the number of arguments you passed to select keys is invalid. Each time you edit a file, the cache is incrementally updated, so clj-kondo is informed about new functions you just wrote.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 9
    Joker

    Joker

    Small Clojure interpreter, linter and formatter

    Joker is a small interpreted dialect of Clojure written in Go. It is also a Clojure(Script) linter. Send HTTP requests, read and parse JSON, work with file system, start external processes etc. Checks for syntax errors, function arity mismatches, unresolvable symbols, unused namespaces, vars, bindings and much more. Joker uses .joke filename extension. Normally exits after executing the script, unless --exit-to-repl is specified before --file <filename> in which case drops into the REPL after the script is (successfully) executed. (Note use of --file, in this case, to ensure <filename> is not treated as a <socket> specification for the reply.) Our goal is to be suitable for scripting (lightweight, fast startup). This is something that Clojure is not good at and my personal itch I am trying to scratch. Also, to provide some tooling for Clojure and its dialects. Joker has linter mode which can be used for linting Joker, Clojure and ClojureScript code.
    Downloads: 2 This Week
    Last Update:
    See Project
  • More Bookings. Better Experience. Icon
    More Bookings. Better Experience.

    For tour and activity providers

    The all-in-one solution built to help you stay organised and get more bookings with thousands of connections to online travel agencies (OTAs), resellers and suppliers.
    Learn More
  • 10
    lint-staged

    lint-staged

    Run linters on git staged files

    Run linters against staged git files and don't let anything slip into your code base! Linting makes more sense when run before committing your code. By doing so you can ensure no errors go into the repository and enforce code style. But running a lint process on a whole project is slow, and linting results can be irrelevant. Ultimately you only want to lint files that will be committed. This project contains a script that will run arbitrary shell tasks with a list of staged files as an argument, filtered by a specified glob pattern. Linter commands work on a subset of all staged files, defined by a glob pattern. lint-staged uses micromatch for matching files. The concept of lint-staged is to run configured linter tasks (or other tasks) on files that are staged in git. lint-staged will always pass a list of all staged files to the task, and ignoring any files should be configured in the task itself.
    Downloads: 2 This Week
    Last Update:
    See Project
  • 11
    commitlint

    commitlint

    Lint commit messages

    commitlint checks if your commit messages meet the conventional commit format. commitlint helps your team adhere to a commit convention. By supporting npm-installed configurations it makes sharing of commit conventions easy. We're not a sponsored OSS project. Therefore we can't promise that we will release patch versions for older releases in a timely manner. If you are stuck on an older version and need a security patch we're happy if you can provide a PR. If something in between fails (like a new packages was added and needs to be published for the first time but you forgot) you can use lerna publish from-package to publish anythign that has not been published yet. We identify ease of adoption and developer experience as fields where there is room and need for improvement. The items on the roadmap should enhance commitlint regarding those aspects.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 12
    gts

    gts

    TypeScript style guide, formatter, and linter

    gts is Google's TypeScript style guide, and the configuration for our formatter, linter, and automatic code fixer. No lint rules to edit, no configuration to update, no more bike shedding over syntax. No configuration. The easiest way to enforce consistent style in your project. Just drop it in. Automatically format code. Just run gts fix and say goodbye to messy or inconsistent code. Catch style issues & programmer errors early. Save precious code review time by eliminating back-and-forth between reviewer & contributor. Opinionated, but not to a fault. We recommend you use the default configuration, but if you need to customize compiler or linter config, you can. Under the covers, we use eslint to enforce the style guide and provide automated fixes, and prettier to re-format code.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 13
    ktlint

    ktlint

    An anti-bikeshedding Kotlin linter with built-in formatter

    No configuration, which means no decisions to make, nothing to argue about and no special files to manage. While this might sound extreme, keep in mind that ktlint tries to capture (reflect) official code style from kotlinlang.org and Android Kotlin Style Guide (+ we respect your .editorconfig and support additional ruleset|s). Built-in formatter. So that you wouldn't have to fix all style violations by hand. Customizable output. plain (+ plain?group_by_file), JSON, HTML and check style reporters are available out-of-the-box. It's also easy to create your own. A single executable jar with all dependencies included. ktlint is a single binary with both linter & formatter included. All you need is to drop it in (no need to get overwhelmed while choosing among dozens of code style options).
    Downloads: 1 This Week
    Last Update:
    See Project
  • 14
    tslint-to-eslint-config

    tslint-to-eslint-config

    Converts your TSLint configuration to the closest possible ESLint

    Converts your TSLint configuration to the closest reasonable ESLint equivalent. The tslint-to-eslint-config command reads in any existing linter, TypeScript, and package configuration files, then creates an .eslintrc.js result based on them. For any TSLint rules with corresponding ESLint equivalents, those equivalents will be used in the new configuration. TSLint rules without ESLint equivalents will be wrapped with eslint-plugin-tslint. If passed without arguments, respects the excludes, files, and includes in your TypeScript configuration.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 15
    PyChecker is a static analysis tool for finding bugs in Python source code. It finds problems that are typically caught by a compiler for less dynamic languages, like C and C++. It is similar to lint.
    Downloads: 10 This Week
    Last Update:
    See Project
  • 16

    Notepad++ Linter

    Linter plugin for Notepad++

    A Notepad++ plugin that allows realtime code check against any checkstyle-compatible linter: jshint, eslint, jscs, phpcs, csslint and many others.
    Downloads: 3 This Week
    Last Update:
    See Project
  • 17
    JCSC is a highly configurable checking tool for your Java source code. It checks the compliance to a defineable coding standard like naming conventions and code structure. Also signs of bad coding, potential bugs are found. JCSC is inspired by lint.
    Downloads: 1 This Week
    Last Update:
    See Project
  • 18
    Angular ESLint

    Angular ESLint

    Monorepo for all the tooling related to using ESLint with Angular

    Monorepo for all the tooling which enables ESLint to lint Angular projects. Follow the latest Getting Started guide on angular.io in order to install the Angular CLI. Create a new Angular CLI workspace in the normal way, optionally using any of the supported command line arguments and following the interactive prompts. As well as installing all relevant dependencies, the ng add command will automatically detect that you have a workspace with a single project in it, which does not have a linter configured yet. It can therefore go ahead and wire everything up for you!
    Downloads: 0 This Week
    Last Update:
    See Project
  • 19
    Ansible-lint

    Ansible-lint

    Best practices checker for Ansible

    Ansible Lint is a command-line tool for linting playbooks, roles and collections aimed towards any Ansible users. Its main goal is to promote proven practices, patterns and behaviors while avoiding common pitfalls that can easily lead to bugs or make code harder to maintain. Ansible lint is also supposed to help users upgrade their code to work with newer versions of Ansible. Due to this reason we recommend using it with the newest version of Ansible, even if the version used in production may be older. As any other linter, it is opinionated. Still, its rules are the result of community contributions and they can always be disabled based individually or by category by each user. ansible-lint checks playbooks for practices and behavior that could potentially be improved. As a community-backed project ansible-lint supports only the last two major versions of Ansible.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 20
    Bootlint

    Bootlint

    HTML linter for Bootstrap projects

    Bootlint is a tool that checks for several common HTML mistakes in webpages that are using Bootstrap in a fairly "vanilla" way. Vanilla Bootstrap's components/widgets require their parts of the DOM to conform to certain structures. Bootlint checks that instances of Bootstrap components have correctly structured HTML. Optimal usage of Bootstrap also requires that your pages include certain <meta> tags, an HTML5 doctype declaration, etc.; Bootlint checks that these are present. Bootlint assumes that you are using Bootstrap's default class names in your webpage, as opposed to taking advantage of the "mixins" functionality of Less or Sass to map them to custom class names. If you are using mixins, Bootlint may report some false-positive warnings. However, there are some Bootlint checks that are applicable even if you are using mixins pervasively.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 21
    cpplint is a free lint for C++. It checks C++ code looking for hard to see errors while also making comments on the code's style.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 22
    CSSLint

    CSSLint

    Automated linting of cascading stylesheets

    CSSLint is an open-source CSS code quality tool originally written by Nicholas C. Zakas and Nicole Sullivan. A lint tool performs static analysis of source code and flags patterns that might be errors or otherwise cause problems for the developer. CSSLint is a tool to help point out problems with your CSS code. It does basic syntax checking as well as applying a set of rules to the code that look for problematic patterns or signs of inefficiency. The rules are all pluggable, so you can easily write your own or omit ones you don't want. You can integrate CSSLint into your favorite IDE to make checking your CSS code quality easy. In fact, some IDEs already have CSSLint built-in. Once you're familiar with the CSSLint command-line interface, the next step is to integrate it into your build system.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 23
    Dockle

    Dockle

    Container Image Linter for Security

    Container Image Linter for Security, Helping build the Best-Practice Docker Image, Easy to start. You can install dockle with the asdf version manager with this plugin, which automates the process of installing (and switching between) various versions of github release binaries. With asdf already installed, run commands to install dockle. You can scan your built image with Dockle in Travis CI/CircleCI. Though, you can ignore the specified target checkpoints by using .dockleignore file. Or, if you just want the results to display and not let the test fail for this, specify --exit-code to 0 in dockle command.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 24
    Ethlint

    Ethlint

    (Formerly Solium) Code quality & Security Linter for Solidity

    Ethlint (Formerly Solium) analyzes your Solidity code for style & security issues and fixes them. Standardize Smart Contract practices across your organization. Integrate with your build system. Deploy with confidence! Solium does not strictly follow Solidity Style Guide. The practices it enforces by default are best practices for the community at large. If you’re using vim with syntastic, and prefer to use a locally installed version of Solium (rather than a global version), you can install syntastic local solium to automatically load the local version in packages that have installed their own. Solium does not strictly adhere to Solidity Style Guide. It aims to promote coding practices agreed upon by the community at large. You can specify rules or plugins to apply as command line options. If you specify one, it overrides its corresponding configuration in the soliumrc file.
    Downloads: 0 This Week
    Last Update:
    See Project
  • 25
    Gulp Boilerplate

    Gulp Boilerplate

    A boilerplate for building web projects with Gulp.js

    A boilerplate for building web projects with Gulp.js. This project is no longer maintained, and is offered as-is. It is strongly recommended that you instead use my Build Tool Boilerplate. Concatenate, minify, and lint JavaScript. Compile, minify, autoprefix, and lint Sass. Optimize SVGs. Copy static files and folders into your dist directory. Automatically add headers and project details to JS and CSS files. Create polyfilled and non-polyfilled versions of JS files. Watch for file changes, and automatically recompile build and reload webpages. Gulp Boilerplate makes it easy to turn features on and off, so you can reuse it for all of your projects without having to delete or modify tasks.
    Downloads: 0 This Week
    Last Update:
    See Project
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