RetroConvert

Drop Babric mods into the mods folder of an Ornithe instance and the converter rewrites them to match Ornithe's Calamus gen2 mappings before the game starts. The conversion runs through a Java agent, so the instance can be launched once and the converted jars are then loaded by Fabric Loader in the same session. Babric and Ornithe both run on Fabric Loader for Minecraft Beta but use different intermediary mappings, which is why Babric mods are not compatible with Ornithe as they are.

Installation takes two steps: place RetroConvert in the instance's mods folder next to the Babric mods, then add the JVM arguments it needs in the instance settings. In Prism Launcher, MultiMC and the vanilla launcher the same line works. Converting can also be run without launching the game, and the first run shows a visible restart prompt after the jars are rewritten. Smart detection leaves Ornithe mods that are already ported untouched, and umbrella mods with nested jars are handled one jar at a time, as with StationAPI.