Note: this post is from 2007, outbound links may be broken.
Angular Momentum releases Stylus RMX Library
Installation instructions are available in the archive. Because of the large download (over 200MB, unpacked over 800MB), the archive is split up into 7 parts.
Also provided are PAR2 files if something goes wrong with your download, then the archive can be repaired with these files using QuickPar.