Grasscutter
A server software reimplementation for a certain anime game
...It uses Java 17, MongoDB, and Gradle, and it has an ecosystem that includes documentation, a launcher, plugins, and community tooling. The project allows users to run a compatible server environment for specific supported game client versions, but it is not actively maintained in the same way it once was. Current documentation warns that version matching matters and that support is limited, especially beyond the older supported release range. Grasscutter is most relevant to developers interested in reverse engineering, server emulation, game protocol research, and modding communities. ...