Consider using **[Trac][1]**.
Trac is a mix of a wiki and an issue tracking system, and with some theming, it will also make a perfect homepage. You can also extend it with plugins. For instance you could implement a project blog by using [blog plugin][2].
I know Trac has some unappealing flavours, but if you really want to focus on your software, Trac is a really good way to put all related stuff in a same place.
Of course if you already have an internal project site / wiki, Trac is not a good option.
[1]:
[To see links please register here]
[2]:
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