Wiki Wiki Farms
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See also:
EditMe - Provides wiki and content-managed website hosting.
JotSpot - Free wiki hosting service; custom software includes calendars, photo galleries and spreadsheets. URL format "http://yourtopic.jot.com/". GUI editing, themes, access control.
On-wiki - Free wiki hosting based on MoinMoin Open Source wiki engine. URLs of form "http://yourtopic.on-wiki.net/". WYSIWYG editing, file upload, custom permissions, ads on each wiki page.
Peanut Butter Wiki - Free ad-supported wiki hosting with paid upgrades available. URL in format "http://yourtopic.pbwiki.com/". Requires shared password to edit, no GUI, file upload, API.
SeedWiki - A Wiki Farm where basic Wikis are free. Offers plugins that allow applications and web sites to be built on a Wiki Framework.
Swiki.net - A wiki farm offering free hosting of Swiki (Squeak Wiki) based wikis.
Wetpaint - Free wiki hosting service with proprietary software, GUI editing interface, and instant site registration. URL for wikis is "http://yourtopic.wetpaint.com/".
Wikia - A collection of freely-hosted ad-supported wiki communities using the Open Source MediaWiki software. URLs like "http://yourtopic.wikia.com/". Requires 2- to 10-day approval process, single sign-on across all Wikia sites, file uploads, transclusion, community help from Wikia staff.
Wikidot.com - Free ad-supported wiki hosting service for non-commercial use, based on Open Source wiki software. URL format is "http://yourtopic.wikidot.com/". Wiki syntax only, interactions with other services, extended and extensible wiki syntax, uploads, forums, private messaging, access control.
Wik.is - Free wiki hosting service based on DekiWiki. Instant registration, URL format "http://yourtopic.wik.is/". GUI editing, login required to edit. Formerly wiki.com.
Wikispaces - A free wiki host providing community wiki spaces, visual page editing, and discussion areas.
XWiki.com - Free wiki hosting site with text ads, using Open Source XWiki software. URLs in format "http://yourtopic.xwiki.com/". Immediate setup, WYSIWYG editor, photo album, calendar, wikiblog interface. Help build the largest human-edited directory on the web.