Pianoteq - Pianoteq is a virtual piano that runs on your computer.
Kontakt - With KONTAKT 6, you can sound like a snare drum, a symphony orchestra, or anything in between, from a universe of sampled instruments.
UVI Falcon - Sampler/synth hybrid instrument
Ivory Grand Pianos - Synthogy v3
TX16Wx - Software sampler VST plugin
H. G. Fortune VST Synthesizers - Collection of VSTi instruments released as freeware on Archive.org