CS-RCS
Inexpensive graphical RCS for Windows 95/NT, free for individuals, includes free standalone CSDiff. (ComponentSoftware)
DOSRCS
DOS port of GNU Revision Control System. Zip files, executables, documentation, and Microsoft C source. By Trumphurst.
GNU RCS
The GNU Revision Control System, a popular free SCM tool on the UNIX platforms.
Purdue RCS Development
Contains UNIX, Windows and DOS distribution files and source, contributed software, support, and documentation.
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.
RCS -- A System for Version Control
A paper describing and introducing RCS, written by Walter Tichy, July 1985. Online in PS and PDF format.
RCS Tutorial - the Revision Control System
Frames-based short HTML online tutorial, by David L. Spencer.
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 GUI.
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.