Oh, how I wish this would have worked for me. I installed flyspray and played with it. Very easy to install and very solid programming effort. However, after trying to put my head around their permissions structure, I finally did a further search of reviews and found that it does not support per-project permissions. Unfortunately I'm an IT consultant with many clients and I have to keep projects and tasks private and not visible between clients. Flyspray's permission model doesn't appear to allow this. It's a shame because the rest of the product looks fantastic. If you don't need to make projects visible to only authorized users, I'd check out this extension and Flyspray