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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.
Keyboard enthusiasts started converting vintage keyboards to modern protocols by using general-purpose controllers such as Teensy and Pro Micro, and wrote free/open-source firmwares for this task. The most comprehensive project was TMK by hasu. It required a lot of technical skills to set up.
QMK is forked from TMK and meant to be more user-friendly (but still requires working with software-development toolchain). It's been used by many vendors in the semi-/custom keyboard space.
Vial was created as a free/open-source alternative to VIA.
Another notable open-source firmware is ZMK, which targets wireless semi-/custom keyboards.