https://tonelib.net/gfx-overview/
This one is free (at least it was, not sure if it still is). Very nice sounding one.
https://www.positivegrid.com/bias-amp/
This one is a paid plug-in. Very realistic models. Comes in Standard, Professional and Elite. You can download a demo to try it out, and between the 3rd and 9th of December you'll get a 50% discount.