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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.
There are about two dozen Ethereum layer 2 scalability projects under development. All but two of the projects on this list are Ethereum-based: https://github.com/Awesome-Layer-2/awesome-layer-2. And some of these have launched, like https://loopring.io, which uses a zkRollup to allow for zero-fee L2 Ethereum transactions with 100% of the security guarantees of Ethereum mainnet.
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.