Here’s a classic amongst amp sim enthusiasts (free or otherwise), the roaring Legion high-gain amp simulator.

“This is an original design, it’s not based on any hardware gear. My goal here was to build a high gain sim that doesn’t need any booster in front in order to be tight.”

Features:

• 2 channels, actually two completely different preamp circuit
• 2 modes on each channel, rhythm and lead
• 2 tonestacks assignable to any of the 2 channels
• the usual drive and tone controls

It looks pretty kick ass too.

DOWNLOAD: http://lepouplugins.blogspot.co.nz/2010/03/legion.html