TortoiseSVN is a Subversion client, implemented as a Microsoft Windows shell extension, that helps programmers manage different versions of the source code for their programs. It is free software released under the GNU General Public License.
GitHub, Inc. is a provider of Internet hosting for software development and version control using Git. It offers the distributed version control and source code management (SCM) functionality of Git, plus its own features. It provides access control and several collaboration features such as bug tracking, feature requests, task management, continuous integration and wikis for every project.
Team Foundation Server (often abbreviated to TFS) is a Microsoft product that provides tools and technologies designed to help teams collaborate and orchestrate their efforts to finish projects or create a product. It enables DevOps capabilities covering the entire application lifecycle.