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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.
fly.io and render.com have free managed Postgres tiers. For Mongo you can use free tier of Mongo Atlas.
fly.io and render.com have free managed Postgres tiers. For Mongo you can use free tier of Mongo Atlas.
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.