"Critical" projects and volunteer maintainers

If you are using the 'pass' password manager, there is an pass-otp extension for OTP secrets and the Browserpass web extension has support for both plain pass secrets and and pass-otp OTP secrets. Extracting the OTP seeds from QR codes is possible using other software, although most TOTP supporting sites give you the secret in plain text initially.

https://github.com/tadfisher/pass-otp
https://github.com/browserpass/