iCloud photo sharing? Works with people that do and do not have iPhones/Macs. At least I know that non-Apple users can see photos in a shared album; I don't know if they can add photos to a shared photo album as well - I've never tried that.

Several years ago I got tired for Facebook and quit it. My parents, in-laws, and siblings have an Apple shared photo album for "general" content and we occasionally set up albums for the same group of folks when there's a big event/trip/etc.

We occasionally Facetime or use chat via Messages. Email's are in the mix as well.

I feel that it works reasonably well.