A configuration management suite that has version, defect, build and issue management tools.

OpenCM is a configuration management system designed for high-integrity operation. It supports cryptographic authentication, end-to-end integrity controls, and file-level ACLs. (open-source)

Offers CodeCollaborator for remote peer code reviews, checklists, and audit trails. Integrated with Visual Studio .NET and 6.0 and Visual Basic.

TLIB is a simple version control system for DOS, Windows, and OS/2. (commercial) (Burton Systems Software)

Peer-to-peer version control system that keeps development in synch using e-mail or LAN. Designed for distributed and mobile development teams. Supports disconnected work.

Low-priced version control system for Windows platforms.

Enterprise SCM solution. Cross-platform, multi-tier, web interface available. (Commercial)

Vesta is a version control+build system that was created by the DEC Alpha development team. It is distributed, but does not support merging yet. Open Source.

UK software change and configuration management consultancy.

A revision-control systems advocacy site which contains essays about various version control implementations, and a comparison.