Forkkit

Forkkit allows Forge mods to reach Bukkit plugin classes and call into them. It works through a service written for ModLauncher 8, which attaches itself to the classloading path Bukkit relies on, so transformation services can also modify Bukkit plugin classes. The author describes the approach as technically possible with some careful code, and notes that Mixin does not work with it.

The mod is built for ModLauncher 8.1.x and targets Mohist 1.16.5 specifically. The author says it is expected to work only on that version and does not commit to others. Support for ModLauncher 9.x is not planned, because the code differs too much from the 8.x line and would need major changes. It is intended for developers who depend on Bukkit plugin classes while writing their own mods.

Installation is simple: place the Forkkit jar in the server's mods folder. Players join without it, since only the server has to run the mod. Forkkit is published for Forge only, with a single game version, 1.16.5, and its latest file is 0.0.7, dated 2024-01-22, on the alpha channel. It is released under the 0BSD License and is not open source, though its source code and issue tracker are public.