Zulip is the best open-source Slack alternative you can get, and it can be hosted on your own server or use it with a paid plan.

Schleswig-Holstein has moved from Microsoft Exchange and Outlook to Open-Xchange and Thunderbird for e-mail. Other EU entities have opted for open-source alternatives. This switch isn't just a ...

‘Most anti-phishing tools stop the attack at the email. That’s fantastic,’ says Kelvin Tegelaar , founder of CyberDrain. ‘But phishing doesn’t just come from email anymore. People get phone calls, SMS ...