Polonium - autotiling for KDE 5.27. Ever since KDE Plasma broke Bismuth on wayland, i've been running with bare Plasma. Polonium is the first project to work (mostly) as Bismuth used to, although it's just one developer working on it as far as i understood and it still has a bunch of bugs. But really looks promising.
Also, KDE 6 (which will break everything again probably) :D