Overview
Apache Subversion is a centralized, open-source version control tool.
Apache Subversion
CollabNet, Inc. founded Subversion in 2000. The software is widely used in both open-source and corporate domains.
TortoiseSVN
TortoiseSVN is an easy-to-use revision control, version control, and source control software tool for the Windows operating system. This tool is based on Apache Subversion. TortoiseSVN provides a nice graphical user interface(GUI) for Subversion.
More Information:
https://subversion.apache.org/