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EDMarketConnector
Downloads commodity market and other station data from the game Elite: Dangerous for use with all popular online and offline trading tools.
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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.
I'd defo recommend installing something like EDMC too which allows you to contribute data to the community tools.
So another very light weight tool to consider that's almost purely for contributing data to the EDDN: EDDLite. It doesn't do much else aside from automatic screenshots converting and offering direct links to your ship build etc.
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.