Trac - Trac is a project management and bug/issue tracking system. Provides an interface to Subversion and an integrated wiki.
BugSplat - No bug is safe! With crash reporting and error monitoring from BugSplat, developers can find, triage, and fix the bugs behind critical defects in half the time. Build, ship, and support your best-ever applications with BugSplat today.
Bandcamp Artists - The Bandcamp app for artists and labels
Plandek - Empowering engineering teams through intelligent insight to deliver software better
Mantis Bug Tracker - Mantis Bug Tracker is a free and open source, web-based bug tracking system.
DoneDone - From planning, to coding, to testing, to customer support, DoneDone is the straightforward, no-nonsense issue tracker. Start a free 30-day trial today!