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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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Outline
The fastest knowledge base for growing teams. Beautiful, realtime collaborative, feature packed, and markdown compatible.
Search no more, it already exists https://www.focalboard.com/
Have a look at Bookstack. It might suit your needs.
outline is the closest equivalent to Notion, but it's notoriously hard to set up. Good news, I made a blog post on how to do 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.