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PSn00bSDK
The most powerful open source SDK for the PS1 (as far as open source PS1 SDKs go). Not recommended for beginner use.
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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.
You can download everything you need from my Github Repo. Message me if you have any questions.
Thankfully though there is a work-in-progress unofficial SDK that is far easier to set up and more optimized than the Sony crap. It's still in its early stages, but you can already do a lot with it. Anything not covered by the SDK is of course still accessible directly by manipulating hardware registers, just like Arduino.
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.