Dynamics ROM is one of the most functional custom ROMs for Windows Phone 7.
It is based on the latest OS version (7.10.8862 to be specific) and contains all existing languages.
I don’t think there is any need in copying key differences and key features. Better to say: every single package is the latest and greatest.
Links to XDA-developers threads:
Titan thread on XDA
Mozart thread on XDA
Related GitHub projects:
NativeDebugger aka WMDC Launcher