cuwo is an open server implementation for Cube World, and includes various utilities to manipulate its data.
See the quick-start guide for a quick way to get started.
Right now, cuwo has a server that can serve clients. Players can see each other in the game, but a lot still needs to be done. There is a basic scripting system in place, which allows for chat commands, etc.
There is also a working MITM server that can inject packets. It's useful for reverse-engineering the protocol and can be used as an alternative to a standalone server.
There is also a working Cube World/Qubicle model converter. Find it in the 'tools' folder.
Perl - protocol RE
DRayX - encrypt.py and protocol RE
MAT4DOR - cub model details
Xaymar - RE and character details