Mats Helgesson : the Maestro Concert Grand
"...the Maestro Concert Grand v2 is a big giga bank using 792 stereo samples of a concert piano, a Yamaha CF3, recorded with two Neumann KM84 microphones, disposed in X/Y, with 5 velocity layers, and weighs 932 MB ! The piano alone, without release samples, weighs 887 Mb and 440 samples. The release samples are 352 and weigh 45 MB. You can play with or without them."
"...But you must have a sampler that can read and play the gigasampler format to use it, like Halion, Kontakt, VSampler, or Gigastudio of course... The only freeware that can read this format are Synthfont and Linux Sampler, and they are not easy to use."