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.

Zenkit - Zenkit is the home you always wanted for your ideas, your projects, your business.

GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab

Asana - Asana project management is an effort to re-imagine how we work together, through modern productivity software. Fast and versatile, Asana helps individuals and groups get more done.

BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.

Flow - Stop managing projects from your inbox.