The Sarien.net interpreter is available under the GPL licence.http://code.google.com/p/sariendotnet/
The Q42 multiplayer engine is available under the MIT license.http://code.google.com/p/q42multiplayer
All games are currently available as low priced collection dvd's at Amazon!
If you enjoy playing on Sarien.net, don't hesitate to purchase these collections. They really are worth the money!