I've used Trac/Subversion before and really like the integration. My current project is using Mercurial for distributed development and it'd be nice to be able to track issues/bugs and have this be integrated with Mercurial. I realized this could be tricky with the nature of DVCS.
12 Answers
I'd also like to add Redmine to the list. I started with Trac, but I found the mercurial support (and the administrative interface for everything) to be much better in Redmine.

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1And Redmine is way better if you are running multiple projects. – Matthew Schinckel Apr 11 '09 at 15:02
FogBugz has tight integration with Mercurial through their Kiln product.

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5Kiln (http://kilnhg.com/) provides even tighter integration between FogBugz and Mercurial – tghw Aug 27 '10 at 16:47
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TracMercurial integrates Trac with Mercurial. Assembla provides free Mercurial hosting with Trac integration.
The idea is that you have a central repository as your master and upload all the subsidiary changes from local repositories into the main one.

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Use this link: http://www.assembla.com/free_mercurial_hosting to create free open source Mercurial repo with Trac integration. I google a lot before found this link... – gavenkoa Oct 29 '11 at 23:24
BugTracker.NET now supports Mercurial integration in the same way it supports Subversion and git. BugTracker.NET is a free, open source, ASP.NET bug tracking system.
Other free, open source bug trackers that support Mercurial:
- Trac - http://trac.edgewall.org/wiki/TracMercurial
- Redmine - http://www.redmine.org/wiki/1/RedmineRepositories
- Roundup - https://www.mercurial-scm.org/wiki/Hook. The Mercurial development team themselves use Roundup.

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Plugin Not Updated To Work With Current Jira Release 4.3 Integration only via FishEye – Elijah Glover Mar 17 '11 at 00:47
Bugs Everywhere is a distributed bugtracking system that supports Mercurial.

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This looks promising, but very experimental. Do you know of any kind of tutorial for installing, setting up, and using? The website seems pretty limited and/or broken at the moment. – dimo414 May 14 '10 at 09:55
I just put together a command-line bug tracker called b for Mercurial which, although it's not as powerful as Trac and the like, is exactly what a lot of situations call for. It's best feature is how easy it is to set up - install the Mercurial extension, and all your repos have a bug tracker at their disposal. I find this incredibly useful on smaller projects that I can't/don't want to set up with a fully fledged tracker living on a server somewhere, just hg b
and go.

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1That is very interesting , i am thinking about developing a web frontend for it for everyone. – Phyo Arkar Lwin Jul 19 '11 at 10:32
There's a BugzillaExtension for adding a comment to a Bugzilla bug each time you mention its number.

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I recently developed a Trac plugin that integrates some Mercurial functionality that TracMercurial Plugin doesn't support yet, it's called TracMercurialChangesetPlugin. It allows you to search in your changesets, to have the cache synced, to view a changelog in your related tickets...
You can read about it at http://tumblr.com/x8tg5xbsh

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