Bonus points if FLOSS

https://github.com/SimpleMobileTools/Simple-Gallery

That's the one I am using. It's perfectly fine for my use. Way better than the default GrapheneOS Gallery App.

https://unsplash.com/s/photos/robot

"Simple Gallery Pro" on F-Droid

I love grapheneos, but i wouls NEVER let people I love use their included gallery app.

Aves

1 - Simple Galery; 2 - Astian Albums; 3 - Gallery by Google

Simple Galery, Astian Albums, Gallery by Google

#simplegallery pro #foss is the best i've found to replace the stock #grapheneos gallery app

Simple gallery, it's #foss (available on f-droid), and you have the option to "buy" a pro version from the play store (the price is minimal, and lifetime).

By the way gigi. U got to pick up your game and define 'best' 😜😜