LTI-Lib is an object oriented computer vision library written in C++ for Windows/MS-VC++ and Linux/gcc. It provides lots of functionality to solve mathematical problems, many image processing algorithms, some classification tools and much more... -LT

Imaging is native Object Pascal image loading, saving and manipulation library. It is available for several platforms and does not require any third party dynamic libraries or other compiled binaries. Main development language is Object Pascal

Extesion for GTK+ GUI, easy to use 2d vector graphic window manager, easy to write addon and expand library