ESTRELLE

ESTRELLE is an altered version of the Estrelle Skies design. The voicebank features a character icon drawn by goldstargloww and designed by Estrelle Skies. They are an androgynous voice best suited for alto and tenor ranges (C3 to F5, roughly) although with good tuning they can sound good outside that range.

Terms of Use (AKA brief legal stuff)

ESTRELLE is completely free for personal use. Commercial use of the Voice is allowed with credit to Estrelle Skies
The Character may only be used for personal use. ESTRELLE may not be used for or promote hateful or criminal content. Mild sexual and/or violent references permitted with both the Character and the Voice. Pornography is not allowed to be created with either the Character or the Voice

What’s UTAU?

UTAU is an open-source singing synthesis software. If you know Vocaloid, it’s quite similar to that. If you don’t know Vocaloid, here’s the quick rundown on singing synthesis. A Voicebank, sometimes called a Voice Database, is a collection of audio samples of a person’s voice. It’s usually just sounds (think “a i u e o”) that can then be put into a MIDI workspace and pitch edited to make a song. Vocaloid, the pioneer software in singing synthesis, is Extremely Expensive. It’s hundreds of dollars to get a functional Vocaloid setup going. Instead, developer Ameya made UTAU (lit. the Japanese word meaning “to sing”). It’s completely free and open source, allowing users to create voicebanks, songs, and even custom UI skins. It’s cool and free. Ever heard the name Kasane Teto? Yep, she originated in UTAU, although now she also has a SynthesizerV voice.