The RCT Technical Information Depot preserves fan reverse-engineering of RollerCoaster Tycoon file formats, checksums, encoding, object data, save files, track designs, and utilities assembled outside the game's official documentation.
GoldenEye Forever turned one Nintendo 64 shooter into a long-running archive of cheats, GameShark codes, custom multiplayer levels, emulator setups, hidden content, community discoveries, and the strange afterlife of a game that never really left.
The TeamTNT memorial preserves the history of the distributed Doom mapping group behind TNT: Evilution, Icarus, Eternal Doom, Boom, and one of the clearest examples of fan modding crossing into official game development.
ToastyTech's Doom pages preserve decades of custom levels, alpha screenshots, joke skins, unfinished experiments, and the stubborn afterlife of a 1993 game.
Carolyn's Creations preserves a huge hand-built archive of Petz, Oddballz, and Babyz modifications, tutorials, tools, breed files, and troubleshooting from the Windows 95 era.
The Duke Nukem Editing Project preserved tutorials, maps, and hard-won PrismEd knowledge for a game whose editing scene could easily have vanished with old forums and fan sites.