Nifty Emacs command of the day: avy-goto-char-timer: https://github.com/abo-abo/avy#avy-goto-char-timer . It combines avy-goto-char with an isearch style search.
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Grasshopper is a super cool app for teaching programming to novices.
It combines elements of Logo (visual feedback) with a great little editor that works well on touch screens.
Really neat code completion tool that combines program synthesis with a debugger, so you can set a break point and ask it to generate snippets using the values available! https://youtu.be/SnkskEgcbuQ
Emacs packages often have great names. Today's favourite: 'lispyville' https://github.com/noctuid/lispyville (combines lispy with evil)