Handily there are a few that offer official models. Amplitube 5 comes with official Fender, Orange, ENGL, Mesa/Boogie, and many more amp and stompbox models that have the original manufacturer's seal of approval. Softube Amp Room also features official Marshall models, so you can get that hallowed JCM800 sound from the comfort of your home studio.
Read more about how we test music-making gear and services at MusicRadar.