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ReflowMaster
Reflow Master is an open source Toaster Oven reflow controller that includes both hardware and software.
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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.
There are other more "deluxe" boards out there that can be great to use - anything by Unexpected Maker is top notch and, to me, worth the premium. But it may not be appropriate for you.
Here's my sun tracker repo. I used this gimbal and these photoresistors. Here's what the cobbled-together project looks like (without the dividers between the photoresistors).
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.