Open Source Objective C Formats and Protocols

Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file. Skim requires OS X 10.10 or higher.

BibDesk is a graphical bibTeX bibliography manager for Mac OS X.

Vienna is an open source Mac OSX RSS reader with support for RSS/Atom/JSON feeds, article storage and management via a SQLite database, written in Objective-C and Cocoa. Feeds can be accessed directly, or through a syncing service supporting the Open Reader API, like BazQux.com, FreshRss.org, FeedHQ.org, InoReader.com or TheOldReader.com. Development now happens on GitHub: https://github.com/ViennaRSS/vienna-rss

TeXShop is a TeX previewer for Mac OS X, written in Cocoa. Since pdf is a native file format on OS X, TeXShop uses "pdftex" and "pdflatex" rather than "tex" and "latex" to typeset in its default configuration; these programs in the standard TeX Live distribution of TeX produce pdf output instead of dvi output. TeXShop uses TeX Live, a standard distribution of Tex programs maintained by the TeX Users Group (TUG) for Mac OS X, Windows, Linux, and various other Unix machines. The distribution includes tex, latex, dvips, tex fonts, cyrillic fonts, and virtually all other programs and supporting files commonly used in the TeX world. The most recent version of this distribution is maintained for the Mac by the MacTeX TeXnical Working Group of the TeX Users Group and available under the "Obtaining" tab.

NewsBlur is an open-source, full-stack RSS news reader and social reading platform with a hosted service and native clients. The backend crawls and parses feeds at scale, stores stories, and pushes updates to users in near real time, while the web app and mobile apps provide rich reading experiences. Its hallmark is “training”: you can tell the system what you like or dislike—authors, keywords, tags—and it prioritizes stories accordingly, surfacing what matters most. Features like saved stories, tagging, full-text search, and offline reading make it practical for heavy information consumers. Social elements allow sharing to your own “blurblog,” following friends, and discovering curated content, which turns a solitary reader into a lightweight network. Architecturally, it demonstrates a production-ready aggregation pipeline, a multi-tenant web app, and cross-platform clients living in one coherent codebase.

GCDWebServer is a modern and lightweight GCD based HTTP 1.1 server designed to be embedded in iOS, macOS & tvOS apps. Elegant and easy to use architecture with only 4 core classes: server, connection, request and response. Well designed API with fully documented headers for easy integration and customization. Entirely built with an event-driven design using Grand Central Dispatch for best performance and concurrency. No dependencies on third-party source code. Parser for web forms submitted using "application/x-www-form-urlencoded" or "multipart/form-data" encodings (including file uploads). Allow implementation of fully asynchronous handlers of incoming HTTP requests. Minimize memory usage with disk streaming of large HTTP request or response bodies. Automatically handle transitions between foreground, background and suspended modes in iOS apps. Full support for both IPv4 and IPv6.

Web Archive Extractor intended to extract webarchive files into folder.

XeTeX is Unicode-based TeX using platform fonts and font technologies (e.g. AAT on Mac OS X or OpenType features on Mac/Linux/Windows) to provide typesetting for all the world's scripts.

Vienna is a freeware Mac OSX off-line reader for the CIX conferencing system with additional support for RSS/Atom feeds.

Chamonix is a CHM viewer for Mac OS X 10.4. It is an Objective-C app that uses CHM lib (http://sourceforge.net/projects/chmlib), Cocoa and WebKit. It supports ToC, Indexing, Search and Favourites and multiple CHM documents.

VocalEasel is a simple lead sheet editor and music rehearsal tool designed for the needs of Jazz vocalists, using LilyPond to produce printable lead sheets and MMA (Musical Midi Accompaniment) to produce MIDI accompaniments.

Iconara DOM framework is a Cocoa-framework for accessing, manipulating and outputting XML-data.

Address Actions manipulates addresses in Mac OS X 10.4 (and hopefully 10.3). Select an address in an email, webpage or other text, then choose Address Actions from the Services menu to add the address to the Mac OS X Address Book or display a map.

ConvertMake is a developer tool for Mac OS X that converts command line build systems into Apple's Xcode .xcodeproj project format.

DTDS is a system of definition of data types for unification of information exchange with use of different Samond Classes Library functions and for generation of source texts based on the completed data type definition

Dry Dock for Oolite was a tool for manipulating ship models for the open source Elite clone Oolite. It does not work on modern systems.

Excalibur is a TeX/LaTeX aware spelling checker. It will also spell check plain text documents.

Information should be unencumbered. FreeEBook is a program designed to make the business of reading and writing books for online publication a simple matter.

A content notification and subscription tool for Google Reader on Mac OS X.

Gallop is a powerful rich text framework that supports Asynchronous display. It encapsulates CoreText's rich text functions and commonly used image processing capabilities. just need use LWTextStorage object instead of UILabel object and use LWImageStorage object instead of UIImageView object,Gallop will make sure your app scroll smoothly. You can also use Gallop to parse HTML pages and customize machining to parse HTML pages into iOS native pages. Use Gallop Building complex rich text interface application, can get a great experience. You can easy to insert local images,web images or UIView object in the text. Easily add click and long press events to the text. Easily draw text frame bouding, drawing the hollow words, sets the text vertical Alignment property, etc Easy to parse the expression in the text, like http(s) link, @ user, # theme #, phone number. Fast to sets the image corner radius property and blur processing, can be processed directly after the image.

Groot provides a simple way of serializing Core Data object graphs from or into JSON. It uses annotations in the Core Data model to perform the serialization.

HessianKit is a Framework for Objective-C 2.0 to allow applications for Mac OS X 10.5, and iPhone 2.0 or later to communicate with Hessian web services. The main goals; Be compliant and forgiving, seamless Objective-C experience, and avoid glue-code.

Converts files from Garmin(R)'s IMG file format to GMAPI file format.

A simple callback-based parser for tabular data encoded as CSV (Comma Separated Values), written in Objective-C. Slightly heavy-weight as it was meant to not take short-cuts as a full push-down automaton state machine parser. This was initially an experiment in how to build such parsers.

Joust is a simple yet powerful HTML editor programmed for Mac OS X using Cocoa frameworks. Includes live previewing and helpful programming tools.