1)   PianoBoy- Virtual Piano VSTi 1.01
PianoBoy is an expressive, realistic and sonically beautiful virtual acoustic piano. With your PC or with your laptop, In the studio or on the flight- just sit in front of your piano and play!

 2)   KB Piano 2.3.3
KBPiano will turn your computer into a piano. Easily create song with multiple instruments (guitar, bass, drums, etc), even if you don't know music theory.

 3)   Virtual Piano 3.0
This is a great virtual piano. All the notes are in tune! The Piano plays very smooth. Probably alot smoother than you would expect a computer piano to play. Compose real music with this accurate piano reprodution. Visit ButtonBeats.com for notes

 4)   A73 Piano Station 1.1.0
Turn your PC into a fun to play virtual piano, synth, or band. Play piano or over 100 other instruments. This virtual piano software combines a drum machine, bass-chord accompaniment, arpeggios to play piano chords & rhythmic patterns, and much more.

 5)   Little Piano 1.0
Convert your PC into a Piano. With Little Piano you'll be making music in no time. Using its simple interface, you'll be able to record songs, use multiple instruments, and share your songs.