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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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Mattermost
Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
Try Matrix and Element.
Try Matrix and Element.
Mattermost can be self-hosted and actually comes with GitLab Omnibus deployments iirc (albeit disabled by default).
Check out https://zulip.com , it is pretty feature rich and allows stuff like LDAPS authentication for free, unlike Mattermost.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.