The Computer Gaming World Museum preserves the complete 1981–2006 run of Computer Gaming World, including searchable scans of the magazine that documented the birth and growth of PC gaming.
Blizzard's surviving Warcraft II strategy archive documents combat math, unit statistics, race matchups, water tactics, map editing, hotkeys, custom scenarios, and competitive multiplayer advice in a dense official web reference.
Juan Soulie's Civilization II CheckPoint survives as a 1997 fan-built strategy hub with maps, scenarios, files, tactics, links, and player suggestions for a Civilization III that did not exist yet.
Will Day's 1995 MechWarrior II FAQ preserved developer answers, hardware requirements, bugs, utilities, and Usenet-era game knowledge almost in real time.
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.
Ruben's preserved SimTower fan page documents cheats, hidden controls, tower-rating tricks, giant lobbies, express elevators and the kind of game knowledge that once lived almost entirely on handmade fan sites.
Mystery Manor has been serving adventure-game players since 2002 with walkthroughs, save files, patches, screenshots, manuals, utilities, interviews and a forum that still uses its haunted-house structure.
Project E.U.N.U.C.H. documented a wonderfully reckless attempt to overclock a cheap 25 MHz Intel 486 by putting the computer in a household freezer, culminating in a claimed 247 MHz run.