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Web Hooks plugin (tcWebHooks)

Trigger webhook POST requests from build events.

WebHooks 2

Allows POST-ing JSON payload upon build finish to a number of registered HTTP listeners.

Unified Push Notifier

a notifier to send build states to Aerogear's Unified Push Server.

Visual Studio Online Team Rooms Notifier

Allows sending notifications from the TeamCity server to Visual Studio Online team rooms.

TeamCity Theatre

a .NET application to monitor your TeamCity builds in your browser or on a TV.