undume

Firefox also provides such an option, see about:keyboard

There are also replacements for xdg-open with more sane (in my opinion) configuration, like jaro: https://github.com/isamert/jaro

Another nice thing about logseq is that you can use it as a self-hosted web app. Thus, there is no need for Electron, you can use a regular browser. However, this requires the File System API, which is missing in Firefox.

There is also a DIY emulator on ATMEGA328 microcontroller: https://paxer.net/voyager/

xmllint can do that:

  curl example.org | xmllint --html --xpath '//some/xpath/selector' -

OATH Tookit provides console tool for generating TOTP codes: oathtool. https://www.nongnu.org/oath-toolkit/