Using the new AMFPHP 1.0 which is still in beta I heaviliy used the documentation which is created with DokuWiki.
I set up a DokuWiki for my own project I am currently running and I am very pleased with the features and its simplicity. There are of course many other Wikis out there with more features like e.g. email notification when changes occur but until now I will stay with DokuWiki.
The DokuWiki site also provides a good overview and comparison with other Wikis.

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