Alternativa Codecademyu za Socket.io sa besplatnom licencom

• Socket.io
  Sve platforme Windows Mac Linux Chrome OS Android iPhone Windows Phone iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Software as a Service (SaaS) Roku JavaScript Python Windows Mobile Apple TV Chrome Docker Ruby Socket.io C++ Amazon Appstore Terminal
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca