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OTPClient
Highly secure and easy to use OTP client written in C/GTK3 that supports both TOTP and HOTP
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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.
Expanding on the recommendations here, if you have some old laptop laying around (or can buy one on the cheap off e.g. Craigslist or something), you could install some Linux distro on it, install an OTP generator app (e.g. OTPClient, and then disconnect it from the network entirely. This would probably be considerably more secure than even using a phone, since the only way for someone to steal your TOTP keys would be to have physical access to the machine (and even that can be mitigated, seeing as how any reasonably-modern Linux distro will support full-disk encryption).