It's rather meta, but I've been really enjoying https://github.com/tonini/overseer.el. If you have a test suite for your elisp library, you probably use ert-runner to confirm your project works in a fresh Emacs instance.
overseer.el then allows you to run ert-runner tests from inside Emacs!
miniblog.
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I've started using DNSControl for configuring DNS for my personal domains and it's been delightful. Declarative DNS!
I get comments (the DSL is just JS), history (it's in git) and trivial rollback! I've switched my DNS provider to Hetzner (which is free!) to use this.
I've now worked on several systems where the JSON was so big that avoiding pretty-printing was a performance win!
I eventually learned that there's a 'correct way up' for USB A cables. The two small holes should be on top.
Tragically not all power adapters get this right, even for name brands. My ability to get the cable right first time still isn't much better than 50%!