From the author:
Ambience is a reverb that rivals the quality of the best commercial reverbs. You are free to decide yourself how much you want to pay for it, and when.
Ambience is donationware. This means that you are kindly asked to send some money to me if you like it or make any profit using it. Send as much as you think it is worth and you can afford. There is -lots- of work behind Ambience, and much of that work has not been fun at all, so this would really be very appreciated. Even a small donation would mean a lot.