While the sounds you get may not strike you as stellar out of the box, with a little tweaking, they sound great in a mix.
Here we have the HyBrit, and as you can probably tell, it emulates a Marshall – namely a JCM800.
LePou has several amp sims modeled after popular Marshall, Engl, Mesa Boogie, Bogner, and Soldano amplifiers, in addition to their own creations. If you’re looking for free amp sims, then another name that’s sure to come up is LePou.