Related toolkits and APIs

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Toolkits top on OpenGL

Many programming interfaces are layered on OpenGL with rich and varied functionality. Not all can interoperate.

Extension libraries

A extension libraries simplifies the work with OpenGL extensions. They are also used to get the function pointers for core OpenGL functions.

GLEW 
A extension library for Windows, Linux, Mac OS X, FreeBSD, Irix, and Solaris.
GLee 
A extension library for Windows, Linux and FreeBSD. Possibly defunct.
gl3w 
An OpenGL3/4 Core context loading library for Windows, Linux and FreeBSD.

Scene graphs

A scene graph works on the top of OpenGL.

Open Scene Graph 
This scene graph works on all Windows platforms, OSX, GNU/Linux, IRIX, Solaris and FreeBSD.
OpenSG 
It's a scene graph which works on IRIX, Windows and Linux.
Gizmo3D 
This scene graph works on all Windows platforms, OSX, GNU/Linux, and IRIX.

Game engines/toolkits

Panda3D 
A C++ 3D game engine with Python bindings.
Delta3D 
Game engine based on Open Scene Graph and ODE.
ClanLib 
A cross platform C++ toolkit library with a BSD style license. Essentially the library offers a series of different functionality under a streamlined API. Its primary focus is on games, although not limited for that usage only.

Other

Equalizer
A crossplatform framework for the development and deployment of parallel OpenGL applications for large scale graphics clusters and multi-GPU workstations.
PixelLight
An open-source cross-platform framework using OpenGL.

Toolkits working alongside OpenGL

Context/Window Toolkits

The creation of a window to render stuff in is not covered in the OpenGL specification. This is handled by platform-specific APIs. These APIs have been abstracted in many toolkits.

OpenGL-specific toolkits. These toolkits are designed specifically around creating and managing OpenGL windows.

  • GLUT : A crossplatform windowing and keyboard/mouse handler. Very old, consider using other toolkits instead.
  • freeGLUT : A crossplatform windowing and keyboard/mouse handler. Its API is a superset of the GLUT API, and it is more stable and up to date than GLUT.
  • GLFW : A crossplatform windowing and keyboard/mouse/joystick handler. Contrary to GLUT, this is more aimed for creating games. Supports Windows, Mac OS X and Unix-like systems such as Linux and FreeBSD.

Multimedia libraries that can create OpenGL windows. These libraries include the ability to create OpenGL windows as part of their focus on being cross-platform libraries for using multiple media.

  • SDL : A crossplatform multimedia library written in C. SDL supports Linux, Windows, Windows CE, BeOS, MacOS, Mac OS X, FreeBSD, NetBSD, OpenBSD, BSD/OS, Solaris, IRIX, and QNX. The code contains support for AmigaOS, Dreamcast, Atari, AIX, OSF/Tru64, RISC OS, SymbianOS, and OS/2, but these are not officially supported.
  • SFML : A cross-platform multimedia C++ API that provides you low and high level access to graphics, input, audio, etc. Free, still updated and written in C++.

Widget toolkits that can create OpenGL windows. These toolkits happen to be able to create OpenGL windows, but their primary focus is on being widget toolkits.

  • FLTK : A small widget library.
  • Qt : A toolkit which abstracts the Linux, MacOS X and Windows away.

Image and Texture Libraries

  • GLAUX : this is a very old library that should not be used anymore. Most people who encounter GLAUX are people who see the NeHe tutorials which haven't been updated in years. NeHe uses auxDIBImageLoad() in order to read BMP files. GLAUX is no longer available.
  • DevIL: DevIL stands for Developers Image Library. It supports many image formats for reading and writing, it supports several compilers and OS (Win, Linux, Mac OSX). The library has a OpenGL-like syntax. It has not been updated recently.
  • FreeImage: FreeImage is an cross-platform image-loading library, with very wide support for image formats (including some HDR formats like OpenEXR).
  • SOIL: SOIL ( Simple OpenGL Image Loader ) is a public-domain cross-platform image loader that's extremely small.
  • GLI: GLI( OpenGL Image ) is a small cross-platform C++ image library able to load DDS textures (DDS9 and DDS10), compressed or uncompressed. It is licensed under the MIT license.

Math Libraries

  • GLM: GLM ( OpenGL Mathematics ) is a cross-platform C++ mathematics library designed to match the GLSL math functions. It also provides vectors and matrices classes and functions to replace the deprecated OpenGL functions and many more features from half-precision floating point or quaternions. It is licensed under the MIT license.
  • TVMet: The Tiny Vector Matrix library using Expression Templates. This math library is focused on performance via the use of expression template metaprogramming techniques and lazy evaluation. It is licensed under a modified from of the GNU LGPL license. The license modification specifically allows static linking without having the entire program be subject to LGPL.

Sound or Audio Libraries

OpenAL 
OpenAL stands for Open Audio Library. It is maintained by people at Creative and nVidia and users. Multi OS support (Win, Linux, Mac OSX). The library has a OpenGL like syntax so it is easy to use. Closed source and open source portions. Access to special SoundBlaster features through extensions.