This is a useful simulator for ES ground and flight crews. It can also be used in Aerospace Education for cadets. You may find it entertaining as you get a score depending on how quickly you find the hidden ELT. I've simulated both the DF and Signal strength modes of the Ltronics L'Per DF. There's also a VOR/DME digital readout, just for fun. So, you can pick up skills with that instrument as well. It's free to use and distribute.
http://www.rovingbits.com/cap/DFsearch.html
Note - last updated September 2020.