Sinatra based server for what we call Cowboy. Specifically built for Prowl written by Montana Mendy. You can use pow.cx to run Cowboy as well. Just symlink Cowboy.
cd httpdocs (or whatever directory you make at first)
git clone http://www.github.com/montana/cowboy.git
chmod u+x cowboy/cowboy.fcgi
chmod u+x cowboy.rb
http://{yourdomain}/cowboyfcgi/
http://{yourdomain}/cowboycgi/hi