There are probably literally hundreds of great plugins out there that employ saturation in various ways, these days. I've bought a huge number of them over the past couple years, for a variety of reasons.
Lately, the one that gets by far the most use by me is the very simple, straightforward, and great-sounding Fuse Audio VPRE376.
Others I've enjoyed a lot are NEOLD Big Al, NEOLD V76U73, Black Rooster VPRE73, Klanghelm SDRR, Waves REDD, and of course the various Soundtoys like Decapitator and Radiator. Good tape sims like Flywheel and Magnetite have lovely saturation capabilities, too.
For precise, ultra-modern control, Saturn is probably unbeatable, but that's one I don't have.