While this is a bit exaggerated, it was inspired by an actual project to which everything except having a Gerrit applies. I just don't want to call out anyone in particular and start a flame war or anything.
My intention is also not to hate on any of the mentioned software or condemn their use. (Except that I really don't get the point of an external issue tracker.)
This is just about having such a giant, confusing dev stack for a non-huge project.