Yep, the two I used to replace it are one, fstop which us my go to, you used to be able to get the pro version for free on fdroid, not sure if you still can. Two, simple gallery, that one I think it has a pro but I can't remember but if it does, you can get it on fdroid.
I like fstop overall more, but simple gallery has most of the same features with imo a slightly worse ui, but it has webp support which is nice.
Yeah I remember the Simple App suite. At first it was just Gallery, then the paid bundle in Google Play, and later other apps followed.
I think LeafPic has a super interesting UI, but that one is proprietary.
I'd be interested to look into the Android side again. I'm on iOS for 5 years now, I bet there are some very nice things to discover!