Top Rated for TeamCity

Buildron

A radiator in a game-like design.

Cradiator

Cradiator is a Windows (WPF) app that displays a summary of Continuous Integration (CI) project statuses.

Continuous Integration Dashboard

a personalized dashboard to display build information from TeamCity (and other CI's).

FluentTc

C# library for TeamCity REST API and also interacting with TeamCity within the build script.

FogBugz Issue Tracker 2

a more recent version of the integration with FogBugz issue tracker.

RunAs

Adds the ability to run builds in sandboxes, under different user accounts (requires TeamCity 6.5.3).

AWS CodePipeline

makes a TeamCity build a part of an AWS CodePipeline stage.