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irdb
One of the largest crowd-sourced, manufacturer-independent databases of infrared remote control codes on the web, and aspiring to become the most comprehensive and most accurate one
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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.
What about irdb? It's a very large database that's growing all the time. It's already very wide and encompasses a ton of devices. I'm sure there are other RF ones, but Harmony does fine without even supporting RF.
NOTE:
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Hence, a higher number means a more popular project.