Alternativer til Masked Cache til Slack med open source-licens

• Slack
  Alle platforme Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry iPad Android Tablet Windows S PlayBook Web Self-Hosted Software as a Service (SaaS) Firefox Opera Chromium Vivaldi Browser BSD Windows Mobile Slack Microsoft Office Outlook Chrome Yandex.Browser Maxthon Brave OpenPGP
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens