List of emulators and/or OSes available to hobbyists?

Fellow RetroComputer enthusiasts, Hello, my name is Kevin, and I'm a RetroComputerHolic. Sadly my limited funds and limited space prevents me from collecting much in the way of hardware. My hardware collection is small. I have a VAXStation 3100/M76 running VMS, a TRS-80 Model IV, and a TI-99/4A. So, the majority of my RetroComputer fix comes from running the various emulators available to hobbyists. As I do occasionally I recently started combing the web in search of emulators and/or OSes available to hobbyists that I'm not already familiar with. I thought this list might have a few pointers to usefil information. I'm currently familiar with Hercules and SIMH emulators. In real life I work as a mainframe operator in a zOS shop and back in college I worked as a volunteer operator on a VAX 11/750 running VMS. So, MVS and VMS are the most familiar to me. But, I enjoy exploring unfamiliar OSes, even if I feel like a fish out of water trying to interact with them them. I have all the freely available IBM OSes, and the non-IBM Music/SP, available for Hercules. I've downloaded all the "Software Kits" listed on the SIMH website. I've joined the HP2000 Family mailing list and have downloaded the HP2000_E and HP2000_F OSes available from the links section of that list. Thanks to a recent e-mail to this list I've been checking out the dtcyber emulator also. So far the only OS I've found to run on the dtcyber emulator is the Chippewa OS. Are there any other OSes available to hobbyists available for the dtcyber emulator? Does anyone have any pointers to other emulators/OSes available to hobbyists? Kevin http://www.RawFedDogs.net http://www.WacoAgilityGroup.org Bruceville, TX