Beatmaker has released Atmos, a free ambient piano rompler for Mac
and PC. Perfect for creating ambient soundscapes, Atmos features a
sampled Grand Piano from C2 to C9 that has been processed with
two types of reverb, distortion and delay.
Compatible with the most popular DAWS, Atmos also features full
gain, pan, LFO rate, LFO depth, reverb and pitch controls. For an
example of the sound Atmos can create check out the youtube video