[eliangcs]

It's not new. One example I look up to is Sidekiq (http://sidekiq.org). It offers a paid subscription for its pro version.

[AtheistOfFail]

Right, but sidekiq's pro version isn't in a github repo. They host a private repo for you when you fork over the cash and discontinue it after a year.

[eliangcs]

HTTP Prompt paid version isn't on GitHub either. It's hosted on a private server only available for paid users.