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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.
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vial-gui
Vial is an open-source cross-platform (Windows, Linux and Mac) GUI and a QMK fork for configuring your keyboard in real time.
If not HRMs, how about Callum-style mods? Callum Oakley's keymap works with exactly 34 keys as it turns out.
My keymap on GitHub
I have been using this setup with a layout derived from seniply for over a year and I've been loving it.
I'm working on a keymap like that. Documentation is a bit out of date as I'm still experimenting with some one-shot mods and layers. https://github.com/fxkuehl/qmk_firmware/tree/kolibri/users/fxkuehl_kolibri
I’ve found 33 keys quite useable! I did give home row mods a try, but didn’t get into them. Instead I have corner mods: Control/A, Shift/Z, Option/X, Layer 1/C, their reflection on the opposite side, and Command/Tab on the leftmost thumb key. The Vial layout configuration can been seen here: https://gist.github.com/bgkendall/230a78e5288cc6550cb7aa46293340c7
zmk keymap