In the name of all that is good and holy, do not go down that staircase

The only one I really remember is Trogdor, but in order to keep it in my heart, I am a proud owner of Trogdor!!: The Boardgame

Depending on the complexity, there’s also abbrev-mode: https://www.gnu.org/software/emacs/manual/html_node/emacs/Abbrevs.html

There’s a fork of Openboard that is trying to update it, but AFAIK, it’s not published anywhere yet: https://github.com/Helium314/openboard

I wish this was exaggerated, but it isn’t at all. Every time I try to learn Haskell, I end up in some tutorial: “You know how you sometimes need to represent eigenvectors in an n-dimensional plane with isotonically theoretical pulsarfunctions? Haskell types make that easy!”

For what it’s worth, you can replace xi with just s or c

I use Fastmail on the web, and Aqua Mail as my Android client.

The joy of using almost any enail servie other than Gmail or Outlook is that you can use basically any IMAP client you want :). Yes, I know that they both also support IMAP, but it never seems to work quite as well as one might hope.