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Sourceforge wiki space

is nice but has some annoyances:
Pros:
  1. Its a great place to put project notes. Saves the trouble of having a separate space on the local computer where notes are stored and have to synched etc etc.
  2. Its a great place for documentation and manuals etc.

Cons:
  1. It will not warn you if you have lost your session - if you save your work, it will lose the draft and say you need to be logged in to edit
  2. Its slow
  3. It has annoying ads on top. Almost half the screen is taken up by non-wiki stuff

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UPDATE:

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