httprepl is a great tool for making HTTP queries to REST endpoints from Emacs. Impressively, it is implemented using parser combinators!
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Counter-intuitively, if you're writing a parser for a programming language, you need it to be a total function. As soon as you build IDE tooling, you need ASTs from invalid or incomplete input.
The parser should return (Ast, List<Error>) rather than Result<Ast, Error>.
It is *really* hard to find a good screenshot for a CLI tool when users are on a mobile browser.
This is the best I've come up with so far. I'm showing the terminal GUI to show where you'd use the tool.
I'm also trying several standalone screenshots to make it more comprehensible.
GIMP is huge tool that I certainly haven't mastered, but it's so useful to have around.
I used it this week to convert images from obscure formats to common ones. It's a great swiss army knife and runs everywhere.