cal3d
- A skeletal based 3d character animation library written in a platform-/graphic API-independent way.
- http://gna.org/projects/cal3d/

Amanith
- A cross-platform (Linux, Win32, Mac OS X, FreeBSD, Linux and IRIX) C++ framework for vector graphics that includes 2D curves, a 2D font engine, bitmap vectorizer, tessellator, and an OpenGL extensions manager. [Open Source]
- http://www.amanith.org

AllegroFont
- AllegroFont is an Allegro wrapper for the wonderful FreeType2 library that makes Allegro (amongst other things) able to load and render TTF and many other famous font formats. Other feature is that it is able to render the fonts antialiased.
- http://chernsha.sitesled.com/index.html

CxImage
- A C++ class for Win32 platforms to load, save, display, transform BMP, JPEG, GIF, PNG, TIFF, MNG, and ICO images.
- http://www.xdp.it/cximage.htm

Metro
- A portable GPL C++ templated library for manipulation, processing and displaying with OpenGL of triangle and tetrahedral meshes. [Open source, GPL]
- http://vcg.sourceforge.net/tiki-index.php?page=Metro

VIGRA
- A computer vision library that puts its main emphasize on customizable algorithms and data structures.
- http://kogs-www.informatik.uni-hamburg.de/%7ekoethe/vigra/

The CImg Library
- The C++ Templated Image Processing Library, provides simple classes and functions to process and display images. For Unix/X11 and Windows. [Open source, GPL]
- http://cimg.sourceforge.net/

OpenSteer
- A C++ library to help construct steering behaviors for autonomous characters in games and animation.
- http://opensteer.sourceforge.net/

ILOG Views Component Suite
- Provides tools for any type of graphic application, including interactive charts, raster and vector maps, GUIs, supervision systems, command-and-control systems, schematics, link layout, C++ 2D graphics, scrollable tables, Activex, graph editors and map r
- http://www.ilog.com/products/views/

PNGwriter
- A C++ library that enables easy plotting to PNG images pixel by pixel in 48-bit colour. Requires libpng. [Open source, GPL]
- http://pngwriter.sourceforge.net/

The LibMaster.com StockChart library
- Representation support for stock charts. [Shareware]
- http://libmaster.com/

TIFF Tools
- A set of C++ binds to libtiff and some utilities for working with multi-page TIFF files created from scanning documents. [Open source, GPL]
- http://tifftools.sourceforge.net/

The Visualization ToolKit (VTK)
- A C++ libraries for 3D computer graphics, image processing, and visualization. Also Tcl, Python and Java implementations based on the class library.
- http://public.kitware.com/VTK/

OglClib
- A OpenGL Class Library, that will enable to build 3D graphical applications under Linux, Windows and soon BeOS.
- http://morgner.com/ogl/

GLT
- C++ library for programming interactive 3D graphics with OpenGL. Aims to augment the OpenGL API with convenient mechanisms for manipulating the OpenGL state machine.
- http://www.nigels.com/glt/