UTAU topic
UTAU is a freeware singing synthesis platform which allows you to create your custom voicebanks, synthesizer engines and plugins.
vocadb
VocaDB is a Vocaloid Database with translated artists, albums, music videos and more.
OpenUtau
Open singing synthesis platform / Open source UTAU successor
ScoreDraft
ScoreDraft is a simple music/singing synthesizer that provides a Python based score authoring interface.
ENUNU
NNSVSのモデルをUTAUで使えるようにするツール (UTAU plugin software powered by NNSVS)
lessampler
lessampler is a Singing Voice Synthesizer
ddb-extraction
Extract the samples of a DDB Vocaloid file.
utaupy
Python3 package for UST(UTAU), INI(setParam), LAB
world4utau
Mirror of the resampler world4utau in http://utau2008.xrea.jp/mp3/engine_hikaku.html