Programming
OPL-DEV		The OPL-DEV project at Sourceforge. Download the latest runtime for your Symbian device here.
Documentation
OPL Wiki		The central reference site for OPL programmers.
Forums
OPL development forums		The forum dedicated to OPL development for all flavors of OPL on AllAboutOPL.
All About Symbian		OPL forum at AllAboutSymbian.com.
My Symbian		OPL forum at MySymbian.com.
Other sources
OPL Diary		The OPL Diary is the 'news' site of OPL. It carries articles, tutorials, interviews and the thoughts of the OPL-Dev team.
FreePOC		FreePOC is dedicated to releasing high quality freeware for EPOC/Symbian. Lots of their software was written in OPL.