Because of the addition of being able to write and add plugins to RPG Developer Bakin, many talented coders have created some very useful ones.
You can find them all in the Bakin Plugins/Scripts page, from Jagonz’s Player Light Plugin to Dale’s Quest System. Most are free, some are paid, so make sure that you support them regardless.
This page is up-to-date at the time of this post, listed in alphabetical order.