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Luna-App
Homebrew App to dump Animal Crossing: New Horizons islands you visit. Now using on-device De- and Encryption!
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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'm really not sure exactly what you're looking for, but here's Luna, a homebrew program that can dump Dream Islands you visit to storage, where you can later use NHSE to copy whatever you like to other islands.
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.