Congratulations to the GitHub team for a great release here on the new Marketplace. I'm Matt - CEO at ZenHub [1], one of the launch partners for the Marketplace. We've been building apps on top of the GitHub platform for 3 years now and watching the evolution has been amazing. The three releases here have really helped with our biggest integrator pain points:
GraphQL - better and faster access to data without hitting API limits
GitHub Apps - not having to ask users for so many permissions!
Marketplace - user acquisition targeted specifically at GitHub users