The hg-git plugin is a tool developed to allow Mercurial users to interact with Git servers, including GitHub, through a lossless bi-directional bridge, enabling the seamless push and pull of repositories between the two version control systems. This plugin, created by Scott Chacon, allows developers who prefer Mercurial to contribute to Git-based projects without needing to switch completely to Git. It supports various Git functionalities such as handling tags, explicit renames, named branches, and octopus merges, and it is implemented entirely in Python, so no external Git installation is required. Although the software is still maturing and may not handle all edge cases perfectly, it works with Mercurial versions 1.1 and 1.2 and is being used by developers on large projects. Users are encouraged to report any issues to improve its robustness further.