This is an ancient project of mine, gammascoututil. It's a tool to read out Gamma Scout Geiger counters via USB and record their radation measurements.
It's kind of abandoned by me. I wanted however to preserve the history and also push some code that has made it through testing, but was never ever released. The last official release is v0.04, but the release candidate that came after (0.05alpha9) is probably also fine. There has been some more development afterwards of which I'm entirely unsure if the code even works. So if you're looking for something reliable, choose one of the older tags.
Most notably, 0.05 adds support for the Gamma Scout Online and some conversion curves from counts/sec to µSv/hr.
The reverse engineered Gamma Scout protocol documentation can be found at https://johannes-bauer.com/linux/gammascout/
GNU GPL v3.