- I-Imagine Interactive - Developers of Chase - Hollywood Stunt Driver.
- Illusion Softworks - Developer of games such as Mafia, Hidden and Dangerous series and Flying Heroes.
- Infinity Ltd - Developers of Pac Man - The Next Generation and Tic-Tac-Toe 3000.
- Infinity Software - Developers of strategy games.
- Information Software - Developers of Arcangel, Domination, Roton and other strategy and arcade games for Windows PCs.
- Inmar Software - Developers of the DieselEngine game engine.
- Instant Access International - Develops game expansion packs such as Track Pack 98 for Grand Prix and Stellar Combat for X-Wing vs TIE Fighter.
- Int13 Production - French publisher of games for handheld platforms including Pocket PC and Sharp Zaurus. Includes product details, free downloads, FAQs and developer profiles.
- Inverse Entertainment GmbH - Company specialized in software development and consulting for the PC platform and. Includes news, products, and contact information.
- Iron Lore Entertainment - Development company founded by Brian Sullivan and Paul Chieffo.
- Isotope244 Graphics LLC - Advanced 3d screen savers and games.
- Isotoxin Industries - Slovak game developers.
- ISPYGames - Home of StarTraders and Hack and Slash.