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Zulip
Zulip server and web application. Open-source team chat that helps teams stay productive and focused.
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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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Mattermost-LDAP
This module provides an external LDAP authentication in Mattermost for the Team Edition (free).
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Zulip -- we use this at my company, and it works quite effectively
Standard IRC with a web interface like The Lounge or Convos
Mattermost
Standard IRC with a web interface like The Lounge or Convos
I wasn't aware of that. Users seem to work around this