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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.
To save you extra search and clicks, here are their github https://github.com/penpot/penpot and open source insight data https://ossinsight.io/analyze/penpot/penpot
Sadly, all Penpot/Figma alternative posts are getting penalized presumably because Adobe employees/Figma people with incentive to see Figma continue are flagging them, but anywho.
Yes, Penpot is a very worthwhile alternative.
Quant-UX is worth a look for prototyping needs, it's OSS as well: https://quant-ux.com/
Frame / Plasmic generates code, the latter focusing on React: https://www.framer.com/ https://www.plasmic.app/
The silver lining of this whole debacle has been actually that it's brought to surface a lot of other alternatives that folks would not have considered or looked into.