OmegaT - OmegaT is a free open-source translation memory application for professional translators written in Java.
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.
Crowdin - Localize your product in a seamless way
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Weblate - Weblate is a free web-based translation management system.
BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.