History: Tiki vs Trac
Preview of version: 9
Trac is focused on software development written in Python.
Tiki is a general purpose wiki-CMS-groupware written in PHP. In Tiki6, Code Review functionality is added.
Wiki Matrix
Compare them at http://www.wikimatrix.org/compare/Tiki-Wiki-CMS-Groupware+TracWiki
Active contributors
Number of contributors who made changes to the project source code each month.
Tiki is in red