OpenUtau is an open source editing environment for UTAU community with modern user experience. The main developer is StAkira, and many other developers have contributed parts as well.
Get started with OpenUtau: https://github.com/stakira/OpenUtau/wiki/Getting-Started
How to use phonemizers: https://github.com/stakira/OpenUtau/wiki/Phonemizers
List of compatible resamplers: https://github.com/stakira/OpenUtau/wiki/Resamplers
Other frequently asked questions: https://github.com/stakira/OpenUtau/wiki/FAQ
Get started with OpenUtau: https://github.com/stakira/OpenUtau/wiki/Getting-Started
How to use phonemizers: https://github.com/stakira/OpenUtau/wiki/Phonemizers
List of compatible resamplers: https://github.com/stakira/OpenUtau/wiki/Resamplers
Other frequently asked questions: https://github.com/stakira/OpenUtau/wiki/FAQ