These are a few of the links you should bookmark

Once again this is not a complete list, only those links I have found that were usefull. I understand there is a lot of software and discussion about software in the user groups (on your left menu) but as I tend to avoid closed groups like that I can't really say one way or the other. The links here are the publicly available ones.

USERMODS

Why install usermods, well sometimes they give you functionality you miss.

Software and Utilities

You should always try to stay up to date with the latest versions of software, and I personally find the updates from the Pycroft site invaluable.

HERCCMD

The HERCCMD program allows Hercules commands to be issued from the guest MVS38J system if the DIAG8 interface is enabled. This is a program most TK3 users installed long ago, so may have forgotten the orional AWS location. HERCCMD details are located here.

RAKF

RAKF is an implementation of the ESG security system (ESG sources are on CBT tape 429 file 165) that has been back-ported to MVS3.8J by some of the VS2 hobbiests (see credits in the RAKF file). The RAKF security system is packaged available to all as an SMP install on CBT Tape 486 file 850 available from http://cbttape.org. Updated copies may be available on the yahoo hercules-390 group but that is members only (you have to sign up to a yahoo account before even attempting to join it and who needs more email accounts)
I have additional notes on RAKF functionality as shipped on the CBT tape 486 if you are interested.