-
game-and-watch-backup
Relatively easy to use scripts for backing up (and restoring) the original Game & Watch firmware.
-
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 flash custom firmware using this thing, but given that you need a genuine ST-Link programmer (starts from $25) and everything else that goes on with it, including a limited amount of memory, then it is not worth the hassle, I think.
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.