Multiplayer Spacewar over websockets built on Erlang with Cowboy. See the blog post
Before you try running it for the first time:
$ rebar get-deps
$ rebar compile
And launch it with the start script:
[jeremy@mbp-0x90:~/code/erlang/eSpacewar(master)]$ ./start.sh
Or from the Erlang shell with correct binary folders on the path:
1> espacewar:start().
Go to the following link (assuming you've run it locally):