Apache Subversion (often abbreviated SVN, after its command name svn) is a source code management (SCM) system distributed as open source under the Apache License.
Note: Tested w/ Ubuntu 20.04.1 LTS.
sudo apt install subversion
It checks out a working copy from a repository
svn checkout https://svn.cou.edu/svn/projects/cat/sources_c/trunk/
It updates a working copy with changes from the repository