Open Sourced Logo Design - Example io.js
True to it's open source nature io.js is using the Github Issue tracker for design proposals. It's not too far from what I use every day, but seeing it out in the wild is cool.
It also surfaces the problems: the wildness and the luck of structure., Design is not just a collection of finished artifacts - it's an evolution. And while you can follow the comments and the new interpretations it's not as perfect as I would like.