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FreeScout
FreeScout — Free self-hosted help desk & shared mailbox (Zendesk / Help Scout alternative)
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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.
A simple self-hosted one: https://zammad.org/
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.