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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've paid for online java classes because I didn't knew nothing about java, but you can find a lot of content online about programming to FTC, also, you can try using an virtual robot like this one or this one (you will need Android Studio and Amazon coretto), the first link comes with a lot of pre-made programs you can use to test and study. You can call me if you have any doubts about programming or trying to install the virtual robot
If you want to learn Java, here is a free book: https://github.com/alan412/LearnJavaForFTC
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.