History Lesson: Extra-Ons was originally a 1.12.2 Forge mod devloped by spjoes (me) and Dbrown55 (now known as "val = int(1)"). Extra-Ons was an addon to Mr.Crayfish's Device Mod. Extra-Ons was officially dicontinued in 2018.
Now, Extra-Ons 2 has arisen which is a port/remake of the original Extra-Ons in 1.16.5 using Fabric. Development is in VERY early beta as of (2/11/21) but development is going fast. All early preview builds will be published in my discord server so it is HIGHTLY RECOMMENDED you join! https://discord.gg/CexQeXX6Bc