I’m using Niagara personally but I know it’s radically different and probably not something I’d recommend to anyone looking for an experience comparable to Nova. Niagara is also not FOSS if that is a priority for anyone.

I know there are some FOSS launchers out there with similar features that folks on Lemmy have recommended, but I don’t know them offhand and haven’t used them myself enough to judge quality.

I use Kvaesitso, it is one of the better open source launchers with a lot of customisability and a very clean design.