Compression Links: GIF
- Detailed information, specifications, and background of the Graphics Interchange Format.
- http://www.compression-links.info/GIF

Graphics Interchange Format
- Provides detailed specification of file layout, encoding and decoding algorithm, and color space model for gif89a.
- http://256.com/gray/docs/gifspecs/

The gif2png Home Page
- Page prepared in 2003 about a program that converts files from GIF to PNG. The conversion preserves all graphic information, including transparency.
- http://catb.org/~esr/gif2png/

The GIF Controversy
- A 2004 article on the GIF controversy seen from a software developer's perspective. Includes original interviews, a historical perspective, and a detailed bibliography.
- http://cloanto.com/users/mcb/19950127giflzw.html

Unisys/CompuServe GIF Controversy
- Old page from the League for Programming Freedom (LPF) on the Unisys patent controversy.
- http://lpf.ai.mit.edu/Patents/Gif/Gif.html

US4558302 Patent
- The US patent covering the LZW compression algorithm used in GIF images.
- http://www.delphion.com/details?pn=US04558302__