Alternativa Similar Worlds - The “New Experience Project”!u za Ruby sa besplatnom licencom

• Ruby
  Sve platforme Windows Linux Android iPhone Windows Phone Blackberry iPad Android Tablet Windows S Web Self-Hosted Software as a Service (SaaS) PHP BSD Windows Mobile Ruby
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca