Really, Redmine is very similar, in my opinion to Trac. But I think it benefits from hindsight and doesn't carry any of the historical implementation limitations/baggage of Trac.
Fossil is a DVCS + Wiki + Bug tracking, though you can choose not to use the DVCS part..
* Light-weight? yes. it's just a single executable <1MB
* Robust? maybe. Projects using Fossil: SQLite, Mongrel2 etc.
We integrated it extensively with Subversion a few years ago, and there already exist pre-built Git integration modules for it. The plugin ecosystem has come a long way.
One important criteria to me personally was the suitability of it for use as a project management and/or feature roadmapping system, not just an actual _bug_ tracker per se, explicitly for bugs in the sense of defects. Mantis performs extremely well on this count as well.
Probably the biggest high-profile use of Mantis I know is Digium's issue tracker for Asterisk: http://issues.asterisk.org/ -- you can see it in action there. Their particular use of it relies on Mantis's extensive ACL features (optional--you don't have to get that complicated if you don't want to!) to open the process of enrollment and bug submission to the public at large, to allow certain people intermediate levels of access (e.g. QA testers), and to impose an actual hierarchy of developers, managers and bug marshals inside the company.
So for e.g. You can follow a particular bug that you are interested in. Or you may follow a particular user who might have filled interesting bugs in the past.
You get an activity stream from the bugs/people/projects that you are following.
I am one of the co-founders so take it with a grain of salt.
I would be happy to hand hold you to implement this and add features if you need them.
Send me an email at vidushi@groupsense.com I promise you it is a new software but we have been using it internally for over a year it is stable and you will love it when in 15 seconds everyday you will be able to look at your activity stream and exactly know what is happening.
www.sifterapp.com
It's beautifully done, the only drawback is that you can't send it e-mail.
http://stackoverflow.com/questions/14293/are-there-any-unhap...
that said, we use redmine at work.
saw this the other day http://16bugs.com/ which looked like it might be interesting.
It's the best bug tracker around. The only downside is that it is so configurable people will start using it or non-bug tracking things, which doesn't work well
It seems to me the choices are:
1. ditz (command-line based version tracker that keeps data in your version control repo - plays well with DVCSes like Git/Mercurial)
2. whatever comes by default with your repo hosting (Github or BitBucket or Google Code for open source SVN)
3. hosted Trac, Redmine or Bugzilla
For client work, I'm using Redmine, although I'm thinking of switching to ditz (or something similar) to make my life simpler.
For personal projects, I either use TODO.txt or the repo-provided bug tracker.
And sorry to Hacker News community for this shameless self-promotion.