Top Rated for TeamCity

TeamFlash

a standalone application (Windows, Linux, Raspberry Pi) to display the build status on Delcom USB lights.

Twitter

( announce), on github.

tctweet

an alternative Twitter integration.

Visuwall

a standalone web-based build statuses visualizer.

Wall-T

By Prim
A build radiator for Team City written in JavaFx.

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.