Prettier 1.13 has had a ton of polish, but this feature really caught my eye: it explicitly adds parentheses to arithmetic operations, to avoid confusion regarding precedence!
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Difftastic uses the same parse tree for diffing and highlighting. This has a really nice side effect: you can spot parsing bugs from highlighting!
It's subtle, but difftastic shows parentheses/braces in bold. I noticed that < and > weren't bold, and fixed the parser :)
Wow, gcc's codebase is amazingly lispy in places: prefix syntax with parentheses, foo_p for boolean functions.
Elixir has a lovely syntax. It has great macro support without requiring parentheses.