Accrescent, for those who don't know, is an alternative android app store. They aim to compete directly with the play store, so unlike F-Droid they include both FOSS and proprietary apps. They are also very security focused. They're still small but I find their approach interesting and their ambition worth supporting.

Unfortunately, as with many FOSS projects, funding is a challenge. If you believe they are worth supporting, please read the linked blog post.

Disclaimer: I'm not affiliated with the project in any way, just a fan trying to raise awareness.