Here's a incomplete list with helpful things to help you with your work on something typography-related ;)
- https://gist.github.com/yckart/c00df74ba685d5209bdb #vertical-rhythm
- https://gist.github.com/yckart/03698c4c2c635fd4853b #typescale
- https://github.com/cferdinandi/kraken
- http://www.markupframework.org/
- https://github.com/imperavi/kube
- https://github.com/typeplate
- https://github.com/inuitcss