Utaformatix (https://sdercolin.github.io/utaformatix3/) is an open source online singing synthesis project converter. It supports vocaloid, utau, deepvocal, cevio and synth-v. This is an electron app which lets you use it offline.
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UtsuUnknown
titinko.utsuv0.4.5
An UTAU frontend implemented in java.
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OpenUTAU Betastakira
stakira.OpenUTAU.Betav0.1.567
Open singing synthesis platform / Open source UTAU successor
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OpenUTAUstakira
stakira.OpenUTAUv0.1.565
OpenUtau is an open source editing environment for UTAU community with modern user experience.