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seedsigner
Use an air-gapped Raspberry Pi Zero to sign for Bitcoin transactions! (and do other cool stuff)
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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.
There are a bunch of BCH folks who use Satochip hw wallets. Electron Cash actually advertises them at the bottom of their homepage (https://electroncash.org/). You can also see that Electron Cash devs worked on the integration here: https://github.com/Electron-Cash/Electron-Cash/pull/2409
The link didn't seem great, Seedsigner uses a Pi Zero, I have no experience with it but it looks interesting especially for the for the somewhat paranoid.