Starting a list for use with the Wiki Engine Review of all Wiki Engines, Wiki Farms, and Wiki Forums (and the Wiki Engine they use) that I can find.
I will start with any lists I can find, which include:
Wiki Farm (apparently to be moved to Wiki Farms)
c2.com 
(looks like useful information -- I wish I had found it earlier)
twiki.sourceforge.net This link is broken -- 2002-07-10 (looks like useful information - I wish I had found it earlier)
--gone to read--
My intent is to maintain the lists in alphabetic order.
The reason is that I am overwhelmed with Wiki Engines.
Alans Wiki -- same as Owl Wiki?
Another Php Wiki -- Aims toward Kehei Wiki compatibility. GPL
Asp Wiki - Wiki implemented in Active Server Pages.
Atis Wiki -- Perl-based, configurable backends (files, CVS) and Look-and-Feel.
Bazza Wiki -- not publicly available
Blast Wiki -- PHP based, very small (needs MySQL).
CLiki - a Common Lisp Wiki with the Standard Set Of Features, plus HTML, less Wiki Case
Cyber Publishing -- a wiki-based Web publishing framework written in Python; GPL
Dev Wiki -- An LGPLd Java Language implementation with CVS versioning and multiple Wiki Spaces. Very flexible/configurable... maybe a little hard to set up.
eWiki -- wiki written in Eiffel Language:
ewiki.sourceforge.net
Dolphin Wiki Web -- Object Arts' GPL Perl Language wiki (supports templates, is used for many sites)
Io Wiki -- written in Io Language to show off Prototype Based Programming
Java Wiki -- is this also Alans Wiki and Owl Wiki? Owl Wiki Screen Shot -- or is Alans Wiki a forum?
Jiki (Jiki Jiki Java) -- An Open Source distributed components-based wiki
Jwiki (Java Wiki) -- A wiki written in Java Language using servlets and MS Access (by Ricardo Clements).
JWiki -- A wiki written in Java Language. Very lightweight server. www.xmission.com
Jos Wiki -- Perl Language (replaced by the Twiki Clone engine)
Free Wiki -- JSP-based Open Source wiki
Friki Servlet -- 'Friki' a "Do the Simplest Thing" servlet-based wiki
Kehei Wiki -- Perl Language, derived from Jos Wiki
Moin Moin -- A Python Language Source Forge project, based on Piki Piki.
Moshi Moshi -- A Scheme Language Source Forge project
Notes Wiki -- A simple wiki written for Lotus Notes
Odd Muse -- A Perl Language derivative of Use Mod used by the Emacs Wiki
Owl Wiki -- Sama as Alans Wiki and Java Wiki?
Open Wiki -- ASP based wiki, has a unique difference engine. BSD license.
Pattern Stories Wiki, a.k.a. Wikic Web
Phiki Wiki -- yet another PHP wiki, based on Piki Piki.
Php Wiki -- PHP-based wiki, runs on Pear:DB, adodb, flatfile or dba, GPL.
Pyle - homepages.kcbbs.gen.nz - Python Language, GPL, (G)DBM or CVS, lots of extensions
Py Wiki -- Python Language, uses RCS, GPL license
Piki Piki -- Python Language, will run completely standalone
Pikie Pikie -- Python Language, lets you put a Web Log on any page (based on PIkiPiki)
Pnuts Wiki -- A wiki written in Pnuts, will run as a servlet. pnuts.org
Qwik Wiki (Qwiki) -- Perl Language, rapid searching, Open Source
Ruby Wiki (RWiki) -- Ruby Language, XHTML1.0 Strict, indent-based text block format.
Simple Wiki -- Squeak wiki (more commonly called swiki)
sfWiki -- PHP and MySQL, for Source Forge sites. sfwiki.sourceforge.net
Spi Der -- Intergraph's ASP-based Wiki.
Squeak Smalltalk -- Distribution includes a wiki in Smalltalk
Striki Wiki -- I don't know what its claim to fame is -- follow the link
Sushi Wiki -- a wiki implemented in Dot Net
Tcb Works -- Free to certain organizations
Thoughts Weaver -- See Org Patterns for instance, not public?
Ti Ki -- Ruby Language, simple and small, with (Japanese) kanji support
Twiki Clone (TWiki) -- Perl Language, mature and full featured system targeting the corporate intranet world
Use Mod Wiki -- Perl Language, actively developed with Wiki Nature options and simple setup.
Vanilla Wiki Clone -- a Rebol Language wiki
Vb Wiki -- Visual Basic, runs under Win95, NT
Web Web -- Might be a victim of leaping Creeping Featuritis
WebWebX -- Derivative of Web Web - see Web Web Two
Wikic Web -- Cee Language based
Wiki Doc -- Macro to make Microsoft Word wiki-like.
Wiki Mode for Emacs -- Local wiki-like editing mode.
Wiki Server for WIN32 -- wiki implemented in C++ as a standalone (minimal!) HTTP 1.0 server
Wiki Slurp -- A spider that downloads a wiki site as local HTML files.
Wiki Web Help -- AJAX wiki designed to operate like a desktop chm help viewer.
Wiki Wiki Web -- Ward Cunningham's original wiki, in Perl Language, using DBM
Wiki Works -- wiki for Visual Works, used heavily and full features.
Wiki++ -- A Wysiwyg Wiki using C++ & IE4. Try Wiki Cpp
Wi Kit -- Based on Tcl and Metakit (also has a local mode)
Wikki Tikki Tavi -- Written in PHP, uses MySQL
Wik Leet -- Extremely fast wiki for Templeet. Written in Templeet language, uses PHP.
Yet Another Wiki -- Squeak based
Yuki Wiki -- Yet another wiki for Japanese.
Zwi Ki (ZWiki) -- Zope Application Server-based, powerful, GPL.
Non-public Wikis, but still worth discussion
Argo Wiki in Visual Works Smalltalk, aka Argo Wiki Wiki
Envisioning Wiki A clone, but not ready yet(?)
Km Wiki -- wiki + Knowledge Management, Java
Ms Wiki -- a Microsoft Front Page friendly wiki
Mu Web Web, and its clones Link fixed -- Tom Stambaugh
Niki Niki -- JPython servlet, now password protected.
Pats Wiki (pWiki)
Panu Viljamaa's Dater
Pro Wiki Engine, a German wiki engine, derived from Use Mod Wiki
Sc Ribble in (re)development, oriented towards project teams
Soft Wiki -- Tcl scripts living in a database that users can modify.
Spike Wiki A clone in development, pending resources
Statistics wiki at Wharton--not ready for public display--uses kwiki
The Wib -- in Perl Language for customer support Link?
Wiki Web Dot Com -- in Smalltalk Language (a product and free service)
Still in development.
Inactive or unreachable (as of October 1999)
Austin David's Kwiki (sorry! It's OK now) -- subject = sailing
Scheme Wiki (no site given, possibly just ideas)
Free Web (404 not found)
System Envisioning Wiki (available, but no edits for 9 months)
Story Base (404 not found)
Of interest to me is how each of these wikis stores its pages. I like having the pages in plain text so that I can port between wikis if need be (I like trying different wikis :-). Is it worth attempting to produce a list of wikis whose pages can be exchanged between them? -- Channing Walton
''Is wiki.cs.uiuc.edu a Wiki Farm? There are a bunch of wikis
there, but only the administrator can set up a new one. (Aside: It uses Wiki Works 0.6)''
See original on c2.com