CICS Community page
Very nice place to get info about CICS. Get news about what is heppening with CICS and join in some of the discussions on the forums.
Hybrid Editor XE
This is a free ISPF like editor for your PC. I use itbecasue it's free. It's not 100% like ISPf but close enough and the help file will get you to be productive quickly.
Hercules Mainframe emulator
This is a genius group of people building software to emulate the mainframe instruction set on pc's. All the info you need is on this site and all I can say is this is very cool as long as you do not break any laws.
Assembler interpreter
A really nice tool to use when developing assembler code. It allow you to write programs and test them om your pc. Did I mention this is a REALLY nice tool?