Gerrit Code Review - OpenSource Git Code Review Tool
Nevercode - Continuous integration & delivery for mobile apps made easy. Build, test & release native & cross-platform apps faster with Nevercode. Sign up for free.
Phabricator - Phacility - Phabricator
CircleCI - CircleCI gives web developers powerful Continuous Integration and Deployment with easy setup and maintenance.
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.
Semaphore - Semaphore is a fully managed, high performance testing and deployment solution for your company. A Continuous Integration tool.