I'm willing to work on an open source app - and you can do a lot with HTML5 web-based apps now and they work on any tablet since they all have browsers.
For jazz guitar I find teachers with online videos that resonate. Then I manage to contact them and pay for direct Skype chats/lessons. It doesn't have to be a formal college setting IMO.
Where are you? What are you doing now? What is your next big project?
Love Awaken the Giant Within. I've been trying to sell online guitar courses for many years, but now I've settled on doing well-paying remote IT contracts and taking months off in between to practice jazz guitar improvisation. I love sharing what I've learned but I guess it doesn't have to be a money maker, just something we all instinctively love to do.