I'm impressed by how many options I'm offered in Common Lisp (in this case sbcl on Sly) for a simple error like an invalid variable name!
miniblog.
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Are there any nice cross-platform ways to trigger a notification from a terminal?
I've been using https://pushover.net/ but you need to use a browser and it's noticeably slower than the native options.
(Pushover is great for mobile notifications though.)
Designing UIs is such a hard problem.
Sometimes I try a bunch of options and I settle on "this one seems the least annoying".
I'm really impressed by the styling options in https://carbon.now.sh for producing images of code.
I'm often dissatisfied with my options for displaying code samples in slides, this might be a better option. Line numbers and (light background) syntax highlighting matter.

