I am very impressed with reveal.js. Easy with a little HTML knowledge, attractive, and effortless code highlighting.
miniblog.
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I am deeply impressed with the work in Prettier to lay out code in an attractive way. https://github.com/prettier/prettier/releases/tag/1.5.0 (beginning to feel like TeX!)
I'm really impressed with rustdoc. It produces attractive, searchable, cross-referenced docs. I'm considering writing some literate Rust.