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marble
garbage-collecting on-disk object store, supporting higher level KV stores and databases. (by komora-io)
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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 can also look into marble (https://github.com/komora-io/marble). It solves the problem of efficiently storing binary data onto the disk, accessing it and defragmentation.
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.