...
- C++ Unit Test Reporting
- TUT C++ Unit Testing framework
- Python Unit Test Reporting
- Perl TAP Formatter - formatter for Perl to transform TAP messages to TeamCity service messages
- TAP Parser - automatically recognizes TAP protocol messages and transforms them to TeamCity test messages
- XML Test Reporting (bundled since TeamCity 4.5)
Notification/Visualizers
- BuildScreen - A standalone Windows application to displays project build statuses from TeamCity. It can be used on a large screen for the whole development team to watch their build statuses as well as on a developer machine.
- buildstatusnotifier - a way to see green/red page mirroring build status
- Cradiator - a standalone Windows application that displays a summary of project statuses.
- CI Monitor support - support for TeamCity in Big Visible Chart CI aggregator(from the comment)
- Google Chrome extension
- Growl Notifier
- Nabaztag Notifier
- tcMonitor
- tcPrettyEmail
- Team piazza
- Tux droid
- Twitter (announce), on github
- VersionOne, download, sources
- WebHooks
- Windows 7 and Vista sidebar gadget
...