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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.
Sometimes the connectors are proprietary but in the end it's just rewired PCIe. It's done on purpose to lock you into their platform. For example FlexibleLOM claims to be all custom, but it's just PCIe with a different wiring. Some figured out how to rewire it back to standard PCIe: https://github.com/TobleMiner/HPE-FlexibleLOM-adapter and with this you can even use FlexibleLOM 40Gbit network cards in your desktop.
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.