Alternativa Sonetsou za Slack sa besplatnom licencom

• Slack
  Sve platforme Windows Mac Linux Chrome OS Android iPhone Blackberry iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Firefox Safari Slack Facebook Messenger Chrome Twitter
• Besplatna licenca
  Bilo koja licenca Besplatna licenca Licenca otvorenog koda Komercijalna licenca