b is a distributed command-line bug tracker for Mercurial. It integrates into your repository structure, it is committed along with your code, and it's powerful enough to scale from a temporary one person project all the way up to distributed team projects with multiple contributors and reporters.
Ranked in these QuestionsQuestion Ranking
Pro No setup needed
You start by simply adding your first bug with hg b add <bug title>.
Pro Fully distributed
It lives with your code. It is suitable for a completely distributed multi-user workflow without central points of failure. Users need not be online to add or change bugs.
Pro 'Get things done, not organized'
b follows the principle, "the only way to make your bug list prettier is to fix some damn bugs."