Ask HN: How do you discover apps?

For web, mobile and desktop platforms, what is your go to source for finding the apps you use everyday? Do you rely on the native app stores, Google, independent app marketplaces, recommendations from friends?

I'm currently working on a solution to improve app discovery for users and user acquisition for app creators. I've asked this question dozens of times but would like to see what the response is on a larger scale. Hopefully this will be useful for anyone marketing their own apps as well.

Thanks.