Open-source feedback software?
thesethings: It's not exactly what you're looking for, but there enough of an overlap for me to mention Review Board, written in Django, that is really for code review, but supports screenshots.Anybody looking to make open source "visual feedback" software  may want to check out the code.http://www.review-board.org
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Hope somebody posts to this thread with a previously unknown open source tool. Because the tools you listed (proofhq.com, getblackboard.com) look great!