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OpenHantek6022
OpenHantek6022 is a DSO software for Hantek USB digital signal oscilloscopes 6022BE / BL. Development OS is Debian Linux, but the program also works on FreeBSD, MacOS, RaspberryPi and Windows. No support for non-Linux related issues unless a volunteer steps in!
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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 by no means an expert but I got myself a Hantek 6022BE. It's 2 channel, 20MHz USB scope that is popular enough to be fairly well supported by the open source community (eg. https://github.com/OpenHantek/OpenHantek6022). It suits my needs pefectly well - I dabble in Arduino, some basic PCB design, etc. and I wanted to see a bit more than a multimeter can show me. I didn't feel like spending 5 times as much on the most basic dedicated scope and so far I'm happy with my choice.