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plane
🔥 🔥 🔥 Open Source JIRA, Linear and Asana Alternative. Plane helps you track your issues, epics, and product roadmaps in the simplest way possible.
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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.
OpenProject. It has a lot of features and they also give you professional support and features optionally if you need that. It has probably all the stuff that Jira has and has some plugins and integrations.
I use https://planka.app/ and I love it
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.