http://www.lkozma.net/wpv/index.html
Visualization from anonymous edits to Wikipedia (almost) in real-time

http://wikiscanner.virgil.gr/
Lists anonymous Wikipedia edits from organizations. You can type in the organization you want to research about and it shows you the results.

http://www.wikimindmap.org/
Easy way of making a mind map based on Wikipedia connections.

http://www.wikirage.com/
Wikirage tracks the pages in Wikipedia which are receiving the most edits over various periods of time.

http://stats.grok.se/
Just enter a Wikipedia article title and press go for the statistics on how much the page has been viewed.

http://dbpedia.org/About
DBpedia extracts structured information from Wikipedia and to make this information available on the Web. DBpedia allows you to ask sophisticated queries against Wikipedia, and to link other data sets on the Web to Wikipedia data.

http://deletionpedia.dbatley.com/w/index.php?title=Main_Page
A website with all deleted articles from Wikipedia.

http://wikidashboard.parc.com/doc/faq.html
A summary graph on top of a Wikipedia page shows the weekly edit pattern of the article.

http://wikipediafs.sourceforge.net/
View and edit Wikipedia articles as if they were real files

http://similpedia.org/
Enter either a URL of the format: http://www.example.com or copy and paste a paragraph of text of at least 100 words to find similar content.