CsaWiki is a very small wiki engine developed by Carlos Silva.
-
Runs on any servlet container from JSP 1.1 and servlet 2.1 (i.e. Tomcat 3.x)
-
It's opensource with Apache 2.0 license.
-
Includes a small search engine and a specific wiki syntax.
-
Supports Wiki Extraction (or wiki tree) using iText (PDF).
-
Supports restrictions on wiki write access to users.
It's under development since Nov. 2004.
See http://ghannid.homeip.net/wiki/MiniWiki.wiki
The site is in Spanish, and it's used as a personal site.