A large library that assists in mod creation.
Editors were moved to BeardLib-Editor a while ago, get them there BeardLib-Editor
The main documentation can be found on the wiki.
You can find them here: https://github.com/ModWorkshop/BeardLib-Templates
It's BeardLib that is causing the crashes. I took an hour to check for any mods that will crash my game from today's update, and BeardLib was the culprit.