I don't get it. I can't see any information on the homepage that makes it different from just using github.
Our second difference is our focus on scientific specific tools like latex, ipython, etc.
I gather that your Mac app may be simpler, but it's not available yet.
Since I don't already have dozens of projects on banyan, it's hard to see the value.
Perhaps it would be a good idea to link to some repos with examples of the fancy LaTeX or IPython formatting