Five Open-Source Slack Alternatives » okTurtles Blog

Slack is a popular team communications application for organizations that offers group chat and direct messaging for mobile, web, and desktop platforms. While Slack offers many benefits to customers, there are also downsides to using the platform, including high subscription fees and the risk of a massive leak of private data if Slack’s servers are ever breached (again).

Source: Five Open-Source Slack Alternatives » okTurtles Blog