CVSNT is a version control system compatible with and originally based on Concurrent Versions System (CVS), but whereas that was popular in the open-source world, CVSNT included features designed for developers working on commercial software including support for Windows, Active Directory authentication, reserved branches/locking, per-file access control lists and Unicode filenames.

[9][10] The modular nature of CVSNT allows server administrators to dynamically enable and disable protocols as well as load additional functions via triggers such as Audit, Defect Tracking Integration, Automatic Checkout (for webservers) and more.

The original limitations addressed were related to running CVS server on Windows and handling filenames for case-insensitive platforms.

After October 2002, CVSNT began its own version sequence beginning with "2" to indicate significant departure from its CVS origins.

In October 2005, the first commercial CVS Suite was released, incorporating non-GPL addins and clients for CVSNT.

[citation needed] On June 30, 2010,[21] March Hare retired the zero-dollar Community edition, however the commercial "CVS Suite" edition with a new CVSNT 2.8 release and support is actively developed[22] and available from the web store,[23] as are snapshots of the older community releases (unsupported, and a fee is required to download).

The description of the public CVS server for source code was updated with the caveat "not guaranteed to be available 24x7,[25] is provided by a volunteer and may be withdrawn at any time".

Software incorporating CVSNT includes: March Hare plans to deliver the following features in the next release:[31]