Heretic II is now 'Open Source'

I just went looking around on the internet and noticed someone has made Heretic II run with tweaked Quake II engine
Heretic II Source Recreation project

And for those who love Star Wars KOTOR there are at least 2 projects to make a SCUMMVM project for running bioware's engine that was used by kotor and some other biodlare games (Available on github).

@edit
the two projekts for kotor etc is xorexos github A reimplementation of BioWare's Aurora engine (and derivatives)

reone github Game engine capable of running KotOR* and TSL*

* it is kotor I: and kotor II: The Sith Lords