I developed Semester Planner (https://semesterplanner.com) which is what helped me pay for college. It is a online student planner for college students that helps them keep tracks of their classes, notes, assignments, and documents.

I am currently working on Enqode (https://enqode.io/) which is platform that takes a hand-drawn wireframe and converts it into a design file or code.

I would say that for any successful business requires a great deal of work to be done. On the surface it will appear that it is easy running such businesses but, in reality it is very difficult especially at scale.