From Wikimedia Incubator
Test statistics Statistics of all test wikis: Number of pages, timestamps of the first and last edit (activity)
Site statistics Monthly statistics of the Incubator site (see also Special:Statistics for current stats)
Site creation log A log of past and upcoming wiki creations
Site creation log/maps A yearly map of geographical distribution of above stats
SiteMatrix List of existing Wikimedia wikis per language
User preferences Statistics about user preferences: language, gender, ... (Live stats)
Users by log action Statistics about deletions, blocks, etc.