1. Beanstalk is the easiest way for tax practitioners to manage their tax workflow. Elegantly store all your client email discussions in one place. Nothing to download or install. Your client doesn’t even need to log in. Email threads are stored aut...

  2. CodePlex is Microsoft's open source project hosting web site.

  3. SourceForge is a web-based source code repository.

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

  5. 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.

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

  7. Kiln is a complete source control management system based on Git and Mercurial.

  8. Collaborate on code with inline comments and pull requests. Manage and share your Git repositories to build and ship software, as a team.

  9. UltraCompare is the name of an advanced level of file and folder comparison platform that is loaded with an advanced level of features and functions.

  10. Kompare is a GUI front-end program that enables differences between source files to be viewed and merged.

  11. Merge and compare your documents online and share.

  12. SmartSynchronize - Comparing Directories the Smart Way. SmartSynchronize is a multi-platform file and directory compare tool. It allows you to compare files or perform 3-way-merges, both with the ability to edit the file contents.