RealTree
RealTree is meant to give your minecraft trees a fighting chance at survival. It will replant trees that have been chopped down, protect the saplings, and make sure that your world stays as lush and shady as it was when you started! It also supports fast-grow and over-grow features so your forests can grow to become even more dense or replenish just as fast as you can chop them!
This plugin is written from scratch but it greatly inspired by LivingForest. RealTree also supports every LF feature, permission, and file type. So, you could literally use it as a drop in replacement for LivingForest.
Also, unlike LivingForest, it is open source and backdoor free!