Em_proxy_example is a project mainly written in Ruby, it's free.
Simple EventMachine proxy daemon with connection pool
== Simple EventMachine proxy daemon using connection pool with EM queue and with example how to test it
Dependencies 'eventmachine' 'daemons'
start server ( ruby start_server.rb ) Server emulates random time spent on proccessing requests ( through add_timer)
start daemon ( ruby start_daemon.rb ) You can pass -d param to daemonize it (than u can stop it this ruby stop.rb)
start client ( ruby start_clients.rb ) This will emulate many clients connection You can change that number by passing number as argument