Ask HN: If money was no object what software would you create?

Imagine you had a Sufficiently Large Budget to create the software you've always imagined. There are still hard problems, you can't just wish a revolutionary new operating system into existence of solve NP hard problems, but you don't have to worry about the budget.

What do you create?

(As a bonus question, what software would benefit humanity as a whole the most if it suddenly sprang into existence)