TortoiseCVS is a CVS client for Microsoft Windows released under the GNU General Public License.

Moreover, it adds icons onto files and directories controlled by CVS, giving additional information to the user without having to run a full-scale stand-alone application.

The tortoise in the logo is called Charlie Vernon Smythe (CVS).

The project was started by Francis Irving when he was employed by Creature Labs to provide a better interface to CVS for his colleagues.

This causes standard non-CVSNT servers to fail as these are not aware of this argument.