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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.
Once you're satisfied search engine indexing works, no vulnerability found and you check all the marks on accessibility, then you can go shopping for a VPS, assuming you need a dynamic website (PHP-based, node.js etc). Static websites today isn't really "static" due to the magic of Jamstack, so you can have dynamically updated blogs or portfolio with blazing access speed for free, with far less security maintenance than a VPS.
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.