UTAU
UTAU or Vocal Synthesizer Tool UTAU is a voice-synthesis software developed by Ameya/Ayame and made for the Windows operating system. Like Vocaloid, you are in control of a vocalist to sing your songs for you. Though UTAU doesn't have as many features as Vocaloid, UTAU does give the option to import your own voices or others' voices into it to be used for singing. - UTAU wikia