Browse free open source C++ Frameworks and projects below. Use the toggles on the left to filter open source C++ Frameworks by OS, license, language, programming language, and project status.

  • ShareCRM is an AI-powered enterprise CRM platform designed to connect data and teams across the entire customer lifecycle. Icon
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  • 1
    Catch2

    Catch2

    A modern, C++-native, test framework for unit-tests, TDD and BDD

    A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch). Catch2 is mainly a unit testing framework for C++, but it also provides basic micro-benchmarking features and simple BDD macros. Catch2's main advantage is that using it is both simple and natural. Test names do not have to be valid identifiers, assertions look like normal C++ boolean expressions, and sections provide a nice and local way to share set-up and tear-down code in tests. You are on the devel branch, where the v3 version is being developed. v3 brings a bunch of significant changes, the big one being that Catch2 is no longer a single-header library. Catch2 now behaves as a normal library, with multiple headers and separately compiled implementation.
    Downloads: 2 This Week
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  • 2
    CoreCLR

    CoreCLR

    Runtime for .NET Core

    CoreCLR is the runtime for .NET Core, an open source, general purpose development platform maintained by Microsoft and the .NET community. It is a cross-platform runtime for cloud, IoT, and desktop apps and includes a just-in-time compiler called RyuJIT.
    Downloads: 2 This Week
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  • 3
    Tracing Framework

    Tracing Framework

    Web Tracing Framework libraries and extensions

    The Web Tracing Framework (WTF) is an open source suite of tools, libraries, and visualizers created by Google to help developers analyze and optimize the performance of complex web applications. By adding lightweight instrumentation to their code, developers can trace execution flow, identify bottlenecks, and detect performance regressions. The framework provides fine-grained insights into application behavior, making it particularly useful for achieving smooth, high-performance experiences, such as maintaining 60fps animations in web interfaces. It includes visualization tools that allow for detailed analysis of timing, resource usage, and event flow, enabling developers to diagnose and fix inefficiencies effectively. While still experimental, WTF is designed to be extensible and community-driven, encouraging contributions and adaptations for various types of web applications.
    Downloads: 2 This Week
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  • 4
    Unified Communication X

    Unified Communication X

    Communication framework for data-centric high-performance applications

    Accelerate Your Network Performance with UCX. Collaboration between industry, laboratories, and academia to create an open-source, production-grade communication framework for data-centric and high-performance applications. Unified Communication X (UCX) is an award winning, optimized production proven communication framework for modern, high-bandwidth and low-latency networks. UCX exposes a set of abstract communication primitives which utilize the best of available hardware resources and offloads. These include RDMA (InfiniBand and RoCE), TCP, GPUs, shared Memory, and network atomic operations. UCX facilitates rapid development by providing a high-level API, masking the low-level details, while maintaining high-performance and scalability. UCX implements best practices for transfer of messages of all sizes, based on accumulated experience gained from applications running on the world’s largest datacenters and supercomputers.
    Downloads: 2 This Week
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  • 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

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  • 5
    VelocityX

    VelocityX

    A minimalist Flutter framework for rapidly building Flutter apps

    A minimalist Flutter framework inspired from TailwindCSS and SwiftUI for rapidly building flutter apps. VelocityX is designed to be easily installed and the only aim was to make it, even more, easier to write UIs. VelocityX lets you focus on your design, and it comes with various widget extensions to make it responsive across devices. Go ahead and check the docs. Extend or customize your UI layout by reusing Flutter widgets. VelocityX can be extended while reusing the same widgets. A framework that gives you all of the building blocks you need to build bespoke designs without any annoying nested styles you have to fight to wrap. VelocityX includes a generous palette of great-looking, well-balanced colors that are perfect for prototyping or for kicking off a brand new project.
    Downloads: 2 This Week
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  • 6
    gRPC

    gRPC

    High performance, open source universal RPC framework

    gRPC is a C-based high performance remote procedure call (RPC) framework that can run in any environment. It efficiently connects services in and across data centers with plenty of support, and can also connect mobile devices and browser clients to backend services. Essentially, it makes it easier for you to create distributed applications and services.
    Downloads: 2 This Week
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  • 7
    mXparser

    mXparser

    Math Parser: Java, C#, C++, Kotlin, Android, and all .NET platforms

    Math Parser: Java, C#, C++, Kotlin, Android, and all .NET platforms (Nuget, Maven, CMake). Supports .NET Framework, .NET Core, .NET Standard, Xamarin, and more. Features: rich built-in library of math functions, operators, constants. Flexible in user-defined arguments, and functions. Expressions are provided as plain text. Easy to use. Well documented. MathParser.org-mXparser is an open-source mathematical expression parser and evaluator for Java and .NET, supporting complex calculations and custom functions.
    Downloads: 2 This Week
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  • 8
    userver

    userver

    Production-ready C++ Asynchronous Framework with rich functionality

    userver is a modern C++ framework for building asynchronous, high-performance microservices. Developed by Yandex, it provides a robust architecture for writing non-blocking network applications, with built-in support for gRPC, HTTP, database clients, metrics, and more. userver is designed for production-scale backend systems that require low latency and high reliability.
    Downloads: 2 This Week
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  • 9
    Pluma
    A minimal C++ framework for plug-in management. Small, cross-platform and simple to use.
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    Downloads: 10 This Week
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  • InEight is a leader in construction project controls software Icon
    InEight is a leader in construction project controls software

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  • 10
    wxLua
    wxLua is a Lua scripting language wrapper for the wxWidgets cross-platform GUI library. It consists of executables for editing, running, and debugging wxLua scripts, a library for extending C++ programs with a fast, small, fully embeddable scripting language, and a variety of sample programs. With wxLua you can quickly write full-featured programs with graphics, networking, printing, etc. for MS Windows, Linux, and OSX.
    Downloads: 9 This Week
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  • 11
    Colorer Library
    Colorer provides source text syntax highlighting services. It colorizes source codes in editor systems (more than 200 syntaxes). Uses powerful HRC format(XML, RE, context free grammas), allowing to support any language. Available as Eclipse plugin.
    Downloads: 8 This Week
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  • 12
    Crystal Space 3D SDK
    Crystal Space is an Open Source 3D SDK for Unix, Windows, and MacOS/X. It renders with OpenGL and features GLSL shaders, CG shaders, deferred rendering, dynamic shadows, bullet based physics library, terrain engine, skeleton based animation meshes, exporter for Blender, portals, etc...
    Downloads: 7 This Week
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  • 13
    This is a generic engine for simulation of Game & Watch games, starting with ports of the Madrigal Game & Watch Simulators (http://www.madrigaldesign.it/sim/). It is designed to run anywhere SDL is available, with emphasis in handheld machines.
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    Downloads: 12 This Week
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  • 14
    STD Foundation Classes

    STD Foundation Classes

    Object oriented frameworks - PowerBuilder, PowerServer & InfoMaker!

    by Chris Pollach (http://chrispollach.blogspot.ca) A fully integrated "object oriented" set of PB Classes for the following products: PowerBuilder, PowerClient & PowerServer. The framework greatly enhances the development process by making the PowerBuilder developer significantly more productive! License: https://sourceforge.net/projects/stdfndclass/files/License (Open Source) => Updated version of the STD "Integrated" framework 2026R1 build 2026.1.0.467 was released to production on 2026-01-09. https://sourceforge.net/projects/stdfndclass/files/FrameWork/Integrated => The STD Framework "Example Apps" 2026 R1 latest builds https://chrispollach.blogspot.com/2026/03/updated.html => Updated version of the STD "Order Entry" example App 2025R2 build 2026.1.0.647 was released on 2026-04-08. https://sourceforge.net/projects/stdfndclass/files/Applications/PowerBuilder/OrderEntry
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    Downloads: 18 This Week
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  • 15
    An object oriented OPC client written in C++, implementing the OPC DA specification version 2.05A.
    Downloads: 10 This Week
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  • 16
    Crow

    Crow

    Crow is very fast and easy to use C++ micro web framework

    Crow is C++ microframework for web. (inspired by Python Flask). If you just want to use crow, copy amalgamate/crow_all.h and include it. C++ compiler with good C++11 support (tested with g++>=4.8). Provide an amalgamated header file crow_all.h with every features. Handler arguments type check at compile time. Now supporting VS2013 with limited functionality (only run-time check for url is available.) Out-of-source build with CMake is recommended.
    Downloads: 1 This Week
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  • 17
    Homie for ESP8266

    Homie for ESP8266

    ESP8266 framework for Homie, a lightweight MQTT convention

    An Arduino for ESP8266 / ESP32 implementation of Homie, an MQTT convention for the IoT. This branch of Homie for ESP8266 implements Homie 3.0.1 and adds support for ESP32. PlatformIO is an open-source ecosystem for IoT development with the cross-platform build system, library manager and full support for Espressif ESP8266 development. It works on the popular host OS, Mac OS X, Windows, Linux 32/64, Linux ARM (like Raspberry Pi, BeagleBone, CubieBoard). Available in the PlatformIO registry. Pretty straightforward sketches, a simple light for example (TODO: adapt to V3). Cute HTTP API/Web UI/App to remotely send the configuration to the device and get information about it. ESP8266 framework for Homie, a lightweight MQTT convention for the IoT.
    Downloads: 1 This Week
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  • 18
    Valdi

    Valdi

    Cross-platform UI framework that delivers native performance

    Valdi is a cross-platform UI framework built to deliver native runtime performance without giving up the fast iteration loop that teams want from higher-level frameworks. You write your UI once in declarative TypeScript (TSX-style components), and Valdi compiles those components directly into platform-native views for iOS, Android, and macOS, instead of relying on web views or a JavaScript bridge. Its design focuses heavily on performance characteristics that matter in real apps, like keeping scrolling smooth, minimizing view creation overhead, and limiting unnecessary re-renders so updates stay incremental and cheap. The framework also emphasizes developer velocity with tooling that shortens the edit–run cycle, including rapid hot reload and a workflow that aims to reduce the traditional compile-test-debug friction in native development.
    Downloads: 1 This Week
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  • 19
    POCO C++ Libraries

    POCO C++ Libraries

    Cross-platform C++ libraries with a network/internet focus.

    NOTE: Current source code as well as bugs/patches are on GitHub: https://github.com/pocoproject/poco/ C++ class libraries for network-centric, portable applications, integrated perfectly with the C++ Standard Library. Includes network protocols (Sockets, HTTP, FTP, SMTP, POP3, etc.), SQL database access and XML parsing. Licensed under Boost license.
    Downloads: 5 This Week
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  • 20
    A software toolkit for using the EPCglobal Low Level Reader Protocol (LLRP) to communicate with conforming RFID readers.
    Downloads: 14 This Week
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  • 21
    The Adobe Source Libraries (ASL) are a collection of C++ libraries building foundation technology to allow the construction of commercial applications by assembling generic algorithms through declarative descriptions.
    Downloads: 8 This Week
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  • 22
    Fuzzy Logic Tools
    Fuzzy Logic Tools (FLT) is a C++ framework for storage, analysis and design of fully general multiple-input multiple-output (MIMO) Takagi-Sugeno fuzzy control systems, without constraints in the order of either the inputs or the output vectors.
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    Downloads: 20 This Week
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  • 23
    Neutralinojs

    Neutralinojs

    Portable and lightweight cross platform app development framework

    Neutralino is a lightweight and portable application development framework. It lets you develop cross-platform applications using JavaScript, HTML and CSS. Why Neutralinojs? In Electron and NWjs you have to install NodeJs and hundreds of dependency libraries. Embedded Chromium and Node creates large overhead and makes even simple apps like “hello world” considerable in size. Neutralino offers a lightweight and portable SDK which is an alternative for Electron and NW.js also with many advantages.
    Downloads: 9 This Week
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  • 24
    Nana C++ Library

    Nana C++ Library

    A modern C++ GUI library

    Nana C++ Library takes aim at easy-to-use and portable library, it provides a GUI framework and threads for easy programming with modern C++ methods, such as traits, metaprogramming and other template technologies. Documentation http://nanapro.org/en-us/documentation Feel free to report a bug at https://github.com/cnjinhao/nana/issues
    Downloads: 3 This Week
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  • 25

    OpenGL Software Development Kit

    Utility libraries for working with OpenGL.

    The Unofficial OpenGL SDK is a collection of utility libraries designed to make it easy to learn the exciting world of 3D programming with the OpenGL library. This project is not associated with The Khronos Group.
    Downloads: 5 This Week
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