Rexx libraries / extension modules
The Rexx news group
The Rexx FAQ
Tutorial: From Classic Rexx to Object Rexx (PDF)
Reprints from Dick Goran's The Rexx Column in OS/2 Magazine
CodeCranker's Rexx directory
Hobbes' OS/2 Dev32 Rexx directory
Hobbes' OS/2 Rexx directory (with search capability)