Emacs' support for OCaml is exceptionally good. Not only does tuareg-mode have a decent REPL integration, but it even has thorough 'pair' highlighting for keywords!
Even more impressively, merlin-eldoc understands scope and shadowing when highlighting symbols!
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The examples coverage in Rust is exceptionally good. It's weird how few languages include an example in their stdlib docs for sorting.
I tried tree-sitter today and it's exceptionally good.
The tooling is wonderful: the basic tutorial shows you how to define a grammar, a test suite, and provides a convenient CLI for generating efficient C parsers!
GitHub READMEs work exceptionally well for projects which only need a single page of docs.
Transitioning to a hosted, multiple page documentation structure is hard though. I've dabbled with a few tools but not found a clear favourite yet.
