Keolab has a special promotion on Spicy Guitar. Until September 22nd you may pay what you want for this recently released guitar synthesizer, with a minimum amount of € 15. After this promotion you pay € 150.
Spicy Guitar is a simulation of nine acoustic guitars. It lets you play solos, rhythm and chords. The guitars are physically modelled, not sampled. A disadvantage of this technique is that it can use a lot of cpu on older systems.
It’s difficult to make a simulation of acoustic or analogue instruments with software. This video shows that Keolab comes quite close with their acoustic guitar simulation: