My favorite is PixelFed. I’m an artist, so Instagram was important for me, but for a few years now it’s absolutely terrible (no reach at all with their special algorithms). PixelFed fixes all that, it replicates the feeling of IG as it was 8-10 years ago: chronological feed, tag-based, no extraneous features. I’m really enjoying it, as I can finally grow again my followship as an artist: pixelfed.org