Analog vs. Digital
These very well-made videos show the difference in sound between an analog guitar amp and various amp sim programs.
Can you hear the difference?
ready to play?
There's nothing that doesn't exist. Simulation, emulation, and modeling.
You'll find all the guitar software there is here.
Impulse Responsive
Whether you're looking for Impulse Responsive Loaders or IRs,
you'll find a wide variety of them in the following links.
Guitar-Sims.com