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Compare them all:
Wikis
Forums
Podcatchers
Weblogs
Features
WikiMatrix lists a plethora of features for each wiki engine. Select a feature from the list below to get some in-depth description and feel free to improve the documentation
Wiki
Media Search
The ability to search within attached files (pictures, PDF, audio, video, presentations, …)
Not sure whether the search will only cover file names or more.