Alternativa Presearchu za Slack z licenco odprtokodnega vira

• Slack
  Vse platforme Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Blackberry 10 Android Wear iPad Android Tablet Kindle Fire Windows S Web Self-Hosted Firefox Opera Safari Internet Explorer Vivaldi Browser Xbox Chromecast Windows Mobile Slack Chrome Microsoft Edge Telegram Yandex.Browser
• Open Source licenca
  Vsako dovoljenje Brezplačna licenca Open Source licenca Trgovsko dovoljenje