Linda Audio has released Rock Amp, free VST2/3 plugin effect guitar amp simulator.
Rock Amp
"My first attempt on VST guitar amp simulator. No specific hardware simulated, no advanced circuit emulation algorithms used - just tuned to sound good to my ears. It is useful for rock and for low to mid-gain sounds, but it is also capable of something close to high gain."
This is only Amp simulator, it does not feature Cabinet simulator. For cabinet simulation you can use some free Impulse response VST plugin like Ignite Amps NadIR.
Visit: rock-amp