uxn
The following guide is old. Go here instead.
Unix
$ git clone https://git.sr.ht/~rabbits/uxn $ cd uxn $ ./build.sh --install
9front
% git/clone https://git.sr.ht/~rabbits/uxn % git/clone https://git.sr.ht/~ft/npe % cd npe % mk install % cd ../uxn % mk install #Get uxn essential roms: % hget https://drive.100r.co/uxn/uxn-essentials-lin64.tar.gz > uxn.tar.gz % tar xzvf uxn.tar.gz % games/uxnemu