Alternativy k Groove pro Slack s bezplatnou licencí

• Slack
  Všechny platformy Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP Windows Mobile Slack Chrome MySQL Community Edition Google Apps Trello PostCenter
• Bezplatná licence
  Jakákoli licence Bezplatná licence Licence Open Source Komerční licence