http://www.mantisbt.org/
HI today I see this in the forum of Coat 3D, I just bought my license yesterday, but they have problems, in my case it¡s the conection betwen C4d and Coat 3d...
Well, I look this service, I think it's free, I don't read nothing about it, but I see all the bugs are very very orndered and it's very easy to find and see the progress of the Bug... I thinked in the post of the Eleven on all people put the Bugs, I don't know but perhaps for admins and people repair the bugs can be more easily use something like this...
How I say i don't look nothing, but perhaps can be usefull..