Ittai
Ittai is a plugin builder for Discord client mods.
Ittai aims to make plugin development experience much easier by making plugins crossplatform, so developers can write code once and run it in other client mods.
Plugins built by ittai can run on BetterDiscord, PowerCord and Vizality
Aagaming fork
After ittai got abandoned by Kyza, AAGaming and AUser forked ittai to continue maintaining it.
This new version also added support for Replugged (PowerCord fork) and GooseMod.
It ended up getting unmaintained after a year.