Crazy Eddie's GUI System is a free library providing windowing and widgets for graphics APIs / engines where such functionality is not natively available, or severely lacking. The library is object orientated, written in C++, and targeted at games developers who should be spending their time creating great games, not building GUI sub-systems!

FreeImage is an Open Source library project for developers who would like to support popular graphics image formats like PNG, BMP, JPEG, TIFF and others as needed by today's multimedia applications. FreeImage is easy to use, fast, multithreading safe, compatible with all 32-bit versions of Windows, and cross-platform (works both with Linux and Mac OS X).

Developer's Image Library (DevIL) is a programmer's library to develop applications with very powerful image loading capabilities, yet is easy for a developer to learn and use. Ultimate control of images is left to the developer, so unnecessary conversions, etc. are not performed. DevIL utilizes a simple, yet powerful, syntax. DevIL can load, save, convert, manipulate, filter and display a wide variety of image formats.

Currently, DevIL can load .bmp, .cut, .dds, .doom, .gif, .ico, .jpg, .lbm, .mdl, .mng, .pal, .pbm, .pcd, .pcx, .pgm, .pic, .png, .ppm, .psd, .psp, .raw, .sgi, .tga and .tif .hdr files.
Formats supported for saving include .bmp, .dds, .h, .jpg, .pal, .pbm, .pcx, .hdr, .pgm,.png, .ppm, .raw, .sgi, .tga and .tif.

DevIL currently supports the following APIs for display: OpenGL, Windows GDI, SDL, DirectX and Allegro. Compilers that can compile DevIL or use it include Djgpp, MSVC++, Linux gcc, Delphi, Visual Basic, Power Basic and Dev-C++.