Integrity). PVCS – originally Polytron Version Control System, developed by Don Kinzer at Polytron, first released in 1985. Now owned by Micro Focus. Quma Version Control System Razor (configuration management), integrated suite from Visible Systems StarTeam – coordinates and manages software delivery process by Micro Focus, formerly Borland; centralized control of digital assets and activities Surround SCM – version control tool by Seapine Software. Team Foundation Version Control - version control system developed by Microsoft for Team Foundation Server, now Azure DevOps Server Vault – version control tool by SourceGear (First installation can be used for free) Visual SourceSafe – version control tool by Microsoft; oriented toward small teams Distributed model In the distributed approach, each developer works directly with their own local repository, and changes are shared between repositories as a separate step. Open source ArX – written by Walter Landry, started as a fork of GNU arch, but has been completely rewritten Bazaar – written in Python, originally by Martin Pool and sponsored by Canonical; decentralised, and aims to be fast and easy to use; can losslessly import Arch archives. It was replaced by a friendly fork called Breezy. BitKeeper – was used in Linux kernel development (2002 – April 2005) until its license was revoked for breach of contract. It was open-sourced in 2016 in an attempt to broaden its appeal again. Darcs – written in Haskell and originally developed by David Roundy; can keep track of inter-patch dependencies and automatically rearrange and "cherry-pick" them using a "theory of patches" DCVS – decentralized and CVS-based Fossil – written by D. Richard Hipp for SQLite; distributed revision control, wiki, bug-tracking, and forum (all-in-one solution) with console and web interfaces. Single portable executable and single repository file. Git – written in a collection of Perl, C, and various shell scripts, designed by Linus Torvalds based on the needs of the Linux kernel project; decentralized, and aims to be fast, flexible, and robust GNU arch Mercurial – written in Python as an Open Source replacement to BitKeeper; decentralized and aims to be fast, lightweight, portable, and easy to use Monotone – developed by the Monotone Team; decentralized in a peer-to-peer way Pijul (https://pijul.org/) - Free and open source (GPL 2) distributed version control system based on a theory of patches and written in Rust Proprietary Code Co-op – peer-to-peer version control system (can use e-mail for synchronization) Sun WorkShop TeamWare