Alternativas ao enban para Slack com licença de código aberto

• Slack
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Apple Watch iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) PHP jQuery Wordpress Slack Chrome Microsoft Office 365 Gmail Cloudron Microsoft Azure Bootstrap Trello Microsoft SharePoint Yii Framework Sandstorm.io Aha! Priority Matrix Roadmap Planner
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial