I know it's small and probably not worth mentioning, but I created a bitcoin exchange's api aggregator (my first Node.js app). Basically it attempts to wrap multiple exchange's api's into 1 common library, so you don't need to constantly look up the docs across different companies.
https://github.com/jxm262/xchange.js
I built another project to analyze prices across the exchanges using the xchange.js library. Surprisingly both have 13 stars on github :) I'm planning to add _alot_ more functionality over the next month or so to both projects.