You will find here a few other retail amplifier simulators that I will introduce only briefly because I don't owe them and I can't test them. Yet, it's important to mention these products for those of you who might be interested in buying them.
Guitar Rig is a good product, but it emulates so many things that you get kind of lost when using it. You want to try everything, mix effects, amps, microphones and in the end, you spend more time tweking stuff than actually playing. And you have so much choice that you can wonder how loyal the sound is when compared to the original gear. Yet, the results can be excellent and Guitar Rig is very thorough. Sound purists may prefer more specialized simulators, with less choice but higher fidelity.
Softube released 3 amp sim packs. The first one is dedicated to Metal amps, the second one to vintage amps, and the last one to bass guitars. Each pack is sold separately and only includes 2 or 3 amplifiers. In the end, it's a good but rather expensive product. Newer Marshall amp sims are also available.
This bass simulator offers one head and three cabs. The first cab is an 8x12, the second is a 4x12, and the third is a small 1x12. You can activate or deactivate the head and/or the cabs, so you can use an external impulse loader with the impulse of your choice.