TortoiseHg was designed to be a shell extension that let users of Mercurial SCM (Hg) work directly from MS-Windows Explorer. TortoiseHg is a set of graphical tools and a shell extension for the Mercurial distributed revision control system.

On Windows,
TortoiseHg consists of a shell extension, which provides overlay icons and context menus in your file explorer, and a command line software named hgtk.exe which can launch the TortoiseHg tools. Binary packages of TortoiseHg for Windows come with Mercurial and a merge tool and are thus totally ready for use "Out of the Box".

On Linux,
TortoiseHg consists of a command line hgtk script and a Nautilus extension which provides overlays and context menus in your file explorer. You must have Mercurial installed separately in order to run TortoiseHg on Linux. TortoiseHg binary packages list Mercurial as a dependency, so it is usually installed for you automatically.

TortoiseHg is primarily written in Python and PyGtk (the Windows shell extension being the notable exception). The hgtk script and TortoiseHg dialogs can be used on any platform that supports PyGtk, including Mac OS X.

Supported Platforms
1. Microsoft Windows XP, Vista, Windows 7
2. Command line support via hgtk
3. Gnome/Nautilus integration
4. Mac OS X port is in progress

The license of this software is Free, you can free download and free use this shell extension software.