There's lots of other features that #Calckey has:
* Antennas
* Clips
* Comment trees
* Misskey Flavoured Markdown (MFM)
* Local-only posting
* Deck layout
Really, there's too much to list -- and if I tried, I'd be here all day.
But really, the only way to understand #Calckey is to give it a shot.
If Calckey intrigues you, go ahead and try it yourself.