- Artifactory - Artifactory repository manager integration and enhancements to Maven release process developed by JFrog
- Crowd Authentication - plugin for TeamCity to allow user login through Atlassian Crowd. (blog post, announcement)
related issue: http://youtrack.jetbrains.com/issue/TW-9752
- Rally - integrates TeamCity with Rally.
- VersionOne, download, sources - by VersionOne
- WhiteSource - integration with WhiteSource open-source licenses management solution
- Sauce Labs - integrates TeamCity with Sauce Labs. (sources)