GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Gerrit Code Review - OpenSource Git Code Review Tool
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
Phabricator - Phacility - Phabricator
Google Cloud Functions - A serverless platform for building event-based microservices.