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AWS Cloudformation

Creates / Updates / Deletes / Validates aws cloudformation stacks.

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).

JetBrains Hub

- provides integration with JetBrains Hub, allowing for single sign-on (SSO) and automatic update of user details from Hub in TeamCity.

OAuth2 authentication

Enable GitHub or generic oAuth2 authentication to build server.

AWS CodePipeline

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

OctopusPuppet

*What* Provides a way to visualize, orchestrate differential deployments in Octopus.

rest-runner-teamcity-plugin

TeamCity build runner plugin for executing REST call and analyzing the response.

Container cloud

By cape
This plugin implements "Agent cloud" functionality for running agents within containers, such as Docker.

Flowdock custom notifier

A custom TeamCity notifier that sends messages to Flowdock on build events.