Public Wiki Forums:The possibly canonical list of public wikis, on the original wiki.
AOLserver Wiki: The official wiki web for AOLserver, America Online's open-source web server.
Bookshelved Wiki: A wiki dedicated to books; an online discussion where the primary topic is books read by the people who contribute.
CommunityWiki: For discussion of communities, both online and in the real world, including management, teaching and conflict mediation.
Crazy Hacks: A database of crazy software- and hardware-projects of geeks all around the world with way too much spare time on their hands.
Gaboons.com: A public wiki about participatory sporting events such as marathons and triathlons.
KmWiki: Large wiki about knowledge management with many resources.
Legjoints: Login based site covering a variety of topics as chosen by its users.
MassMind Personal Computer Technical Reference: A wiki-like site that allows anyone to post new information, with page ownership and editors to keep things organized and tons of PC and embedded controller engineering information.
SVG Wiki: Resources and links for the Scalable Vector Graphics community.
TourBusMap: Central staging point for the "Tour Bus" system of routes between similarly-themed wikis.
wikiHow: A collaborative writing project to build the world's largest how-to manual.
Wikipedia: The biggest multilingual free-content encyclopedia on the Internet. Over two million articles and still growing.
Wine-Wiki: A project geared to provide peer created How-Tos, tips, and documentation to users of the Wine application.