Broca is a really tiny frontmatter parser and extractor. It's mostly just a wrapper around CSON, and it weighs in at 450 bytes unminified.
Brio extends Broca to support Jekyll-style layouts. It doesn't do any IO, you just give it a templater (Handlebars would suffice), a tree of templates (with frontmatter), a dotted path to a template, and a data object.
Hope they can be of use to someone :)