What I'd love to have is a command line interface to existing bug trackers.
Nowadays I use Pivotal Tracker, which has a very nice Web API. That allowed me to write yet another CLI tool (cleverly named Pivotal Slacker) which works quite nicely for fetching lists of stories, adding new stories, doing bulk updates or additions from yaml files, and the like.
The upshot is that all Web-based tools should try to offer a decent RESTful API as well so that folks who want additional tools can add them without having to worry about coding to the quirks of Web page scrapping.
It could use some love as contributions have dropped off and I haven't had time to maintain it myself for quite a while.
However, it is quite useable.
Not that there's anything wrong with the other two, but Redmine is miles ahead, in my opinion.
It syncs with various online bug trackers and supports full offline manipulation of the bugs. I would use it if I didn't just make a list of stuff to do in a text file.
- create a simple website form for bug reports, which emails to the project mailing list, where all discussion should happen anyways
- let a bot scan the mailing list for bug reports and commit them, wherever suited