- Burn All GIFs - Information on upgrading a web site from the patent-encumbered GIF format to freely available graphics.
- US4558302 Patent - The US patent covering the LZW compression algorithm used in GIF images.
- Unisys/CompuServe GIF Controversy - League for Programming Freedom (LPF) page on the Unisys patent controversy.
- GIF Economy: A Cautionary Tale - Article on the GIF controversy seen from a software developer's perspective. Includes original interviews, a historical perspective, up-to-date information and a detailed bibliography.
- The gif2png Home Page - The program converts files from the Graphic Interchange Format to Portable Network Graphics. The conversion preserves all graphic information, including transparency. The program can recover data from corrupted GIFs.
- Graphics Interchange Format - Original specification describing the file layout as originated by CompuServe. Also known as Gif87a.
- Graphics Interchange Format - Provides detailed specification of file layout, encoding and decoding algorithm, and color space model for gif89a.
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