Mattermost is the number one open source Slack alternative, and can be hosted on a proprietary platform that you manage yourself.
When teams use these tools, they can become more productive because of direct communication via chat in specialized channels. There, they can exchange quick information bits – even files (images/video, anything) and datafiles that are used by applications.
You can use Mattermost via a browser, or use the platform-specific app on your mobile device. No specific personal data is used other than your email address.
What is also one of its killer features is that it easily connects to third-party applications and systems such as GitLab, Jira Jenkins, Nagios, Zabbix, Kopano, and many more! ...
