xoreos VS tfn-module

And let's not forget their next Engine (Aurora) also has an in-progress implementation : https://github.com/xoreos/xoreos/

If you can read C++, you can read the reimplemented stuff in the xoreos-tools or xoreos itself. There's also a similar reimplementation project just for KotOR, reone.

Xoreos - Neverwinter Nights

There is a Neverwinter Nights module called The Frozen North that you may want to give a try in a few months as they are about to start focusing on the areas around Icewind Dale.

If you're looking for an example Persistent World module to use as a base for making your own module (or just to host as a new server you can put up for people in your language), there are a couple of publicly released persistent worlds out there. You'll find some on the Vault. There is also The Frozen North: https://github.com/b5635/the-frozen-north

On Store Buy Before NWNX event: https://github.com/b5635/the-frozen-north/blob/master/src/nss/on_pc_buyb.nss Seeding Khadala's store: https://github.com/b5635/the-frozen-north/blob/master/src/nss/mer_khadala.nss

Wiki: https://github.com/b5635/the-frozen-north/wiki

Check out the source of others, for example https://github.com/b5635/the-frozen-north