CWCVS - Version control plug-in for CodeWarrior that talks to CVS. - http://www.electricfish.com/products/CWCVS/
CWProjector - Version control plug-in for CodeWarrior, talks to Projector via SourceServer, and maintains version history. - http://www.electricfish.com/products/CWProjector/
MacCVSClient - MacCVSClient is a free CVS client running on Mac OS 7.1 and later. It has got Mac OS look and feel and some handy features to view logs, diffs, resolve conflicts, and store resource forks in a diffable and mergeable format on CVS servers. - http://www.heilancoo.net/MacCVSClient/
Macintosh Version Control - Richard Wesley's extensive summary of available tools, links, articles, vendors, and other resources. - http://www.electricfish.com/hawkfish/macvcs/
MacCVS Pro - MacCVS.org is sponsored by Netscape Communications Corporation and mozilla.org. Its mission is to provide free and open CVS client software for Mac OS by coordinating, building, and guiding the public sharing of such software originally developed at Netsc - http://www.maccvs.org/