...
- GitHub - integration with GitHub issue tracker; TeamCity 9.1-compatible fork. (Since TeamCity 10, alternative implementation is bundled)
- FogBugz - integration with FogBugz issue tracker. announcement
- FogBugz - a more recent version of the integration with FogBugz issue tracker
- Redmine - original issue, builds; TeamCity 9.1-compatible fork.
- RMTrack - integration with RMTrack
- SourceForge integration
- integration with SourceForge as an issue tracker - TargetProcess by simoneb - TargetProcess issue tracker integration
- TargetProcess by shahabhameed - TargetProcess issue tracker integration
- TFS issue tracker - TFS workitems issue tracker integration. (announcement)
- TFS WorkItem - TFS workitems issue tracker integration. This is a re-work of the "TFS issue tracker" plugin to use native TFS libraries instead of calling a process to get the details
- Trac - announcement, related issue. See also Trac plugin for TeamCity
- Visual Studio Online Work Items
- integration with Visual Studio Online as an issue tracker (since TeamCity 10.0, an alternative implementation is bundled).
...