Calckey, a fork of Misskey, has been in development for almost a year but now it's ready for general use! it features groups, quote posts, a custom Markdown implementation, chat, emoji reactions, and a whole bunch of quality-of-life features!
I like it so far, and it has a number of features I've been wanting in mastodon. The only thing holding me back is not having a good mobile app yet since that's where I do most of my social media browsing. I can get it on Fedilab, but that was built with mastodon in mind and is missing some features, and is sometimes a bit wonky.
@salarua, @madcodger, the PWA is excellent! I've found it to be extremely responsive, even on older android devices. It's a very nicely built UI/UX. For me, it's already everything Misskey is but a bit more polished.