Pdp8emu is a project mainly written in ..., it's free.
Emulator of PDP-8 minicomputer written in Ruby with GUI in wxRuby
This is simple project where I learn and test how to work with wxRuby. Goal of this project is to build pdp8 emulator which is enough functional and give it a nice GUI in wxRuby. Resulting code should be tested under different Unix/Linux versions and distributions and also Microsoft Windows XP.
--Radek Hnilica