A wiki that was created before Wikipedia?! It's imposibble!
Type:
Database
Hosting service:
Self-hosted
Founding date:
January 30, 1999
Founder(s):
Jim Leonard Brian Hirt
MobyGames is a wiki dedicated to all video games and discusses everything related to them; it was founded in 1999 by Jim Leonard and Brian Hirt and is hosted by Atari, which is based in France in Paris.
It's very hard to contribute here because an edit has to be approved by a moderator and edits are very often skipped although this is to prevent spam and vandalism, also it doesn't work on MediaWiki.