ThisWiki was the original WikiWiki software running on 4x13.
The first Github commit was made on January 6, 2016, but I'm not sure when I first wrote it...
This software, WikiWikiWiki, basically does everything it does, but better. So use this instead.
It's most notable for having received a large number of edits from SageruIrc and related communities. Maybe the old content will be restored when I finally get my hands on that old hard drive on the other side of the world...