W-RCS - an Windows RCS Front End - W-RCS is a Win32 graphical user interface (GUI) for document revision control. It makes running several of the command-line utilities comprising the GNU Revision Control System (GNU RCS) version 5.7 more accessible to users familiar with the MS-Windows GU - http://www.connix.com/~btober/wrcs/index.htm
RCE: the Revision Control Engine - Designated successor to RCS. Offers VRCE, Java based graphic user interface, and Byte Differencing Engine, efficient delta revision storage that supports all data types. API enables integration into any electronic data management system. - http://www.aicas.com/rce.html
Purdue RCS Development - Contains UNIX, Windows and DOS distribution files and source, contributed software, support, and documentation. - http://www.cs.purdue.edu/homes/trinkle/RCS/
RCS Tutorial - the Revision Control System - Frames-based short HTML online tutorial, by David L. Spencer. - http://www.csc.calpoly.edu/~dbutler/tutorials/winter96/rcs/
Walter F. Tichy's Home Page - Professor of Computer Science at the University Karlsruhe, Germany, creator of RCS. Some pages in English, some in German, including two talks on software configuration management. - http://wwwipd.ira.uka.de/~tichy/
DOSRCS - DOS port of GNU Revision Control System. Zip files, executables, documentation, and Microsoft C source. By Trumphurst. - http://www.trumphurst.com/dosrcs.phtml
CS-RCS - Inexpensive graphical RCS for Windows 95/NT, free for individuals, includes free standalone CSDiff. (ComponentSoftware) - http://www.componentsoftware.com/csrcs/
GNU RCS - The GNU Revision Control System, a popular free SCM tool on the UNIX platforms. - http://www.gnu.org/software/rcs/rcs.html