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nano-trackball
A very small trackball-only mouse. Mechanical files, PCBs, and firmware all included.
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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.
Outside of the Ploopy, if you haven't checked out u/Jfedor's stuff I highly recommend it. They created an open source rp2040-PMW3360 pcb specifically for creating new kinds of trackballs. I have bunch coming on the way now (It's a little pricier due to the smd components) and the parts to make trackball 7 when I get here. It's bigger (uses a standard billiard ball) but it seems closer to the direction I'd like. /u/azat-dev on here posted a modified Kyria using Jfedor's 3360 breakout but I don't think they can post the files because it uses modified closed source code.
I second checking out the ploopy. I use a Sofle and a Ploopy Nano in the middle, and then modified my layers so that there is a series of click options on both sides. It does the job for now, but I still find myself wanting a click option at the base.