License: $800 per license
Support: $160/year per license
Add'l costs: Server plus operating system
Perforce is a client/server system using TCP/IP. Perforce uses caching to provide remote users better project access. It includes defect tracking, triggers, optional file locking, and integration with lifecycle management environments. They tout their speed for checking in/out, merging, etc. Users say it doesn't require extensive maintenance. Perforce also has flexible user/project permissions.