Really impressed with Fish: tab completion of command names /with description/, argument completion based on history (a la Ctrl-C in bash)
miniblog.
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Rust and RISC-V both feel like they've reached critical mass and I'd guess that they'll be used more in 5 years than they are today.
What other technologies fit this description?
One cute feature of markdown I'd not noticed before: there's no syntax for images *without* a description (i.e. alt text).
My favourite pull requests are PRs that are obviously correct after you've read the description.