You're looking for a free AI singing tool!

There are several options available that allow you to create AIgenerated singing voices without spending a dime、Here are a few:

1、Amper Music: Amper is an AI music composition platform that includes a singing feature、While it's primarily a paid service, they offer a free trial that allows you to create a short song with AIgenerated vocals.
2、AIVA: AIVA is another AI music composition platform that includes a singing feature、They offer a free plan that allows you to create music with AIgenerated vocals, although with some limitations.
3、Magenta Studio: Magenta Studio is a free, opensource tool developed by Google that includes a singing feature、You can use it to generate singing voices using AI algorithms.
4、eSynth: eSynth is a free online tool that allows you to create AIgenerated singing voices、You can input a melody and lyrics, and the AI will generate a singing voice.
5、Singing Vocals by Lalal.ai: Lalal.ai is a popular tool for extracting vocals from songs, but they also offer a free AI singing feature that allows you to generate singing voices.

Keep in mind that the quality and features of these free AI singing tools may vary, and some may have limitations or watermarks on the output、However, they're a great starting point for experimenting with AIgenerated singing voices.

Which one of these options sounds interesting to you, or would you like more information on a specific tool?