Introduction and links about the Intel-based Hercules mainframe emulator, as well as an MVT tutorial and MVS 3.8 binaries and add-ons. http://www.schaefernet.de/hercules/
A volunteer effort by many authors to create a Documentation for the Hercules emulator, coordinated by Cory Hamasaki, divided into Primary, Non-Install and Advanced topics. http://www.kiyoinc.com/hercdoc.html