Lighthouse is the perfect project management tool that puts simple issue tracking and bug tracking directly at your fingertips. It is perfect for development teams (or teams of any kind) and even has subversion integration.
Unfuddle is a secure, hosted software development environment providing Git hosting, Subversion hosting, bug and issue tracking, milestones, time tracking, audit trails and more.
Flexible web based bug tracking, issue tracking, task tracking, and project management software solution used for open source and enterprise projects. Free 30-day eval.
Beanstalk allows designers and developers to store source code, track changes, and collaborate with their team through Git and Subversion version control.
Pivotal Tracker is an award-winning, simple, effective, agile project management tool that allows your team to collaborate around a shared backlog of stories in real time.