Fandom - The entertainment site where fans come first.
ConnectedText - ConnectedText is a powerful but simple information management system.
Miraheze - Miraheze is a wiki farm (hosts wikis) for free and with no ads, it also provides custom domains...
TiddlyWiki - a non-linear personal web notebook
Wikiful - Wikiful is an online platform that makes it easy to build and share a wiki.
wikidPad - wikidPad is an application for storing thoughts, ideas, todo lists, contacts, or anything else that user can think of to write down.