Today I include a simple pointer to GNU RCS, which I currently maintain. The design and initial implementation of this software was done a long time ago by Walter F. Tichy. My part is a circa-2010 reimplementation (using obstacks), the writing of the manual, and modernizing the Autotools-based configuration. It was (and continues to be) a good learning experience.
Copyright (C) 2017 Thien-Thi Nguyen