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xtdb
An immutable database for application development and time-travel data compliance, with SQL and XTQL. Developed by @juxt
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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.
You could run Datomic On-Prem on GCP (or anywhere else). If you're investigating alternatives like Datahike/Datalevin, I would also recommend looking at https://xtdb.com/.
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.