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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.
here's one I (partially) wrote for hammerspoon. https://github.com/Hammerspoon/Spoons/blob/master/Source/Token.spoon/init.lua
Since you want specifics: https://github.com/pquerna/otp
Huh? Who is saying you need a smartphone? PyPi accepts TOTP as 2FA. TOTP is an open standard that has been around for at least a decade already and is very easy to implement, literally 20 lines of python. There are a ton of TOTP applications available, from CLI, to GUI on desktop systems, to Android apps, iOS, etc. If you have any device, be it a computer, phone, tablet, etc., which you do since you need one to publish the code from, you can easily generate TOTP codes. Heck, you could even do it by a hand on a paper.