* [C++ Standard Library](http://en.wikipedia.org/wiki/C%2B%2B_Standard_Library) - A collection of classes and functions, which are written in the core language and part of the C++ ISO Standard itself.
* [Standard Template Library](http://en.wikipedia.org/wiki/Standard_Template_Library) - The Standard Template Library (STL).
* [libPhenom](https://github.com/facebook/libphenom) - libPhenom is an eventing framework for building high performance and high scalability systems in C.
* [LibSourcey](https://github.com/sourcey/libsourcey) - C++11 evented IO for real-time video streaming and high performance networking applications.
* [LibU](https://github.com/koanlogic/libu) - A multiplatform utility library written in C.
* [Loki](http://loki-lib.sourceforge.net/) - A C++ library of designs, containing flexible implementations of common design patterns and idioms.
* [MiLi](https://code.google.com/p/mili/) - Minimal headers-only C++ Library.
* [openFrameworks](http://www.openframeworks.cc/) - An open source C++ toolkit for creative coding.
* [Qt](http://qt-project.org/) - A cross-platform application and UI framework.
* [Reason](http://code.google.com/p/reason/) - A cross platform framework designed to bring the ease of use of Java, .Net, or Python to developers who require the performance and strength of C++.
* [STXXL](http://stxxl.sourceforge.net/) - Standard Template Library for Extra Large Data Sets.
* [Ultimate++](http://www.ultimatepp.org/) - A C++ cross-platform rapid application development framework.
* [Windows Template Library](http://sourceforge.net/projects/wtl/) - A C++ library for developing Windows applications and UI components.
* [Yomm11](https://github.com/jll63/yomm11) - Open multi-methods for C++11.
* [Evolving Objects](http://eodev.sourceforge.net/) - A template-based, ANSI-C++ evolutionary computation library which helps you to write your own stochastic optimization algorithms insanely fast.
* [Neu](https://github.com/andrometa/neu) - A C++ 11 framework, collection of programming languages, and multipurpose software system designed for: the creation of artificial intelligence applications.
* [libev](http://libev.schmorp.de/) - A full-featured and high-performance event loop that is loosely modelled after libevent, but without its limitations and bugs.
* [libevent](http://libevent.org/) - An event notification library.
* [bzip2](http://www.bzip.org/) - A freely available, patent free, high-quality data compressor.
* [LZ4](https://code.google.com/p/lz4/) - Extremely Fast Compression algorithm.
* [LZMA](http://www.7-zip.org/sdk.html) - The default and general compression method of 7z format.
* [miniz](https://code.google.com/p/miniz/) - Single C source file Deflate/Inflate compression library with zlib-compatible API, ZIP archive reading/writing, PNG writing.
* [Minizip](https://github.com/nmoinvaz/minizip) - Zlib with latest bug fixes that supports PKWARE disk spanning, AES encryption, and IO buffering.
* [Snappy](https://code.google.com/p/snappy/) - A fast compressor/decompressor.
* [ZLib](http://zlib.net/) - A very compact compression library for data streams.
* [ZZIPlib](http://zziplib.sourceforge.net/) - Provides read access on ZIP-archives.
* [C++ B-tree](https://code.google.com/p/cpp-btree/) - A template library that implements ordered in-memory containers based on a B-tree data structure.
* [SQLite](http://www.sqlite.org/) - A completely embedded, full-featured relational database in a few 100k that you can include right into your project.
* [Cocos2d-x](http://www.cocos2d-x.org/) - A multi-platform framework for building 2d games, interactive books, demos and other graphical applications.
* [Qwt](http://qwt.sourceforge.net/) - Qt Widgets for Technical Applications.
* [QwtPlot3D](http://qwtplot3d.sourceforge.net/) - A feature-rich Qt/OpenGL-based C++ programming library, providing essentially a bunch of 3D-widgets.
* [OtterUI](https://github.com/Twolewis/OtterUI) - OtterUI is a User Interface development solution for embedded systems and interactive entertainment software.
* [wxWidgets](http://wxwidgets.org/) - A C++ library that lets developers create applications for Windows, Mac OS X, Linux and other platforms with a single code base.
* [nope.c](https://github.com/riolet/nope.c) - A C language-based ultra-light software platform for scalable server-side and networking applications. Think node.js for C programmers.
* [POCO](http://pocoproject.org/) - C++ class libraries and frameworks for building network- and internet-based applications that run on desktop, server, mobile and embedded systems.
* [ofxBox2d](https://github.com/vanderlin/ofxBox2d) - openFrameworks wrapper for Box2D.
* [Simbody](https://github.com/simbody/simbody) - High-performance C++ multibody dynamics/physics library for simulating articulated biomechanical and mechanical systems like vehicles, robots, and the human skeleton.
* [Expat](http://www.libexpat.org/) - An XML parser library written in C.
* [Libxml2](http://xmlsoft.org/) - The XML C parser and toolkit of Gnome.
* [libxml++](http://libxmlplusplus.sourceforge.net/) - An XML Parser for C++.
* [PugiXML](http://pugixml.org/) - A light-weight, simple and fast XML parser for C++ with XPath support.
* [RapidXml](http://rapidxml.sourceforge.net/) - An attempt to create the fastest XML parser possible, while retaining useability, portability and reasonable W3C compatibility.
* [TinyXML](http://sourceforge.net/projects/tinyxml/) - A simple, small, minimal, C++ XML parser that can be easily integrating into other programs.
* [TinyXML2](https://github.com/leethomason/tinyxml2) - A simple, small, efficient, C++ XML parser that can be easily integrating into other programs.
* [TinyXML++](https://code.google.com/p/ticpp/) - A completely new interface to TinyXML that uses MANY of the C++ strengths. Templates, exceptions, and much better error handling.
* [Xerces-C++](http://xerces.apache.org/xerces-c/) - A validating XML parser written in a portable subset of C++.
* [Eigen](http://eigen.tuxfamily.org/index.php) - C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
* [ZBar](http://zbar.sourceforge.net/) - A barcode scanner library, which allows to scan photos/images/video streams for barcodes and return their value.
*List of tools for improving quality and reducing defects by code analysis*
* [Cppcheck](http://cppcheck.sourceforge.net/) - A tool for static C/C++ code analysis. - [source](https://github.com/danmar/cppcheck)
* [OCLint](http://oclint.org/) - A static source code analysis tool to improve quality and reduce defects for C, C++ and Objective-C. - [source](https://github.com/oclint/oclint)
* [List of tools for static code analysis](http://en.wikipedia.org/wiki/List_of_tools_for_static_code_analysis#C.2FC.2B.2B) - A list of tools for static code analysis from Wikipedia.
* [The C++ Annotations](http://cppannotations.sourceforge.net/annotations/html/) - An in-depth guide on C++, intended for people with a good knowledge of C who want to make the transition to C++.
* [The Definitive C++ Book Guide and List](http://stackoverflow.com/questions/388242/the-definitive-c-book-guide-and-list) - A collection of quality books and an approximate skill level.
* [Awesome C Programming Tutorials in Hi Def [HD]](https://www.youtube.com/playlist?list=PLCB9F975ECF01953C) - A collection of detailed C Programming Language Tutorials for Beginners and New Programmers.
* [C++](https://www.youtube.com/playlist?list=PL2F919ADECA5E39A6) - by VoidRealms.
* [C++ Qt Programming](https://www.youtube.com/playlist?list=PL2D1942A4688E9D63) - by VoidRealms.
* [C++ Programming Tutorials Playlist](https://www.youtube.com/playlist?list=PLAE85DE8440AA6B83) - thenewboston Official Buckys C++ Programming Tutorials Playlist.
* [C++ Programming Tutorials from thenewboston](https://www.youtube.com/playlist?list=PLF541C2C1F671AEF6) - These are all of thenewboston's C++ programming tutorials.
* [C++ GUI with Qt Playlist](https://www.youtube.com/playlist?list=PLD0D54219E5F2544D) - Official Playlist for thenewboston C++ GUI with Qt tutorials.
* [C Programming Tutorials](https://www.youtube.com/playlist?list=PL78280D6BE6F05D34) - All of thenewboston's C programming tutorials are right here.
* [github-cheat-sheet](https://github.com/tiimgreen/github-cheat-sheet) - A list of cool features of Git and GitHub.
* [ToolsOfTheTrade](https://github.com/cjbarber/ToolsOfTheTrade) - Tools of The Trade, from Hacker News.
* [cheatsheets.org](http://www.cheatsheets.org/) - The largest collection of reference cards for developers.
* [cheat-sheets.org](http://www.cheat-sheets.org/) - All cheat sheets, round-ups, quick reference cards, quick reference guides and quick reference sheets in one page.
* [thefreecountry.com](http://www.thefreecountry.com/) - A collection of free programming resources, free webmasters' resources, free security resources and free utilities.