In addition to downloads from SourceForge.net, Tiki is available from many other other sources (such as the Windows Web App Gallery, auto-installers, and virtual appliances), making its true install base impossible to calculate.
Tiki is also the most collaborative project on SourceForge.net, with more than 500 registered contributors able to commit code fixes. Countless others have contributed to Tiki by testing, reporting bugs, suggesting new features, answering forum questions, and contributing to the documentation.