BitBucket - Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.
Beyond Compare - Beyond Compare allows you to compare files and folders.
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.
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
GitLab - Create, review and deploy code together with GitLab open source git repo management software | GitLab
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.