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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.
Regardless, though, you can see that there's no msys2_install.sh in the util directory, so it's likely that guide is outdated.
Technically, even Notepad would work, though you probably want something with syntax highlighting. Personally, I use Sublime. Atom is another popular one, though it's more structured and project-based. Notepad++ is an older classic that might be considered simpler. Configuring QMK is very simple, so you don't need much.
NOTE:
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Hence, a higher number means a more popular project.