UTAU is a free, open-source-like (but not open-source) synthesizer that uses WAV files and frequency maps . It is not Vocaloid but can import Vocaloid VSQ files. Hundreds of free UTAU voicebanks exist.
18;write_to_target_document1a;_iGruaYPcLeCjseMPr9KvyQI_10;56; vocaloid voicebanks free
: A free, neural-network-based singing synthesizer that produces highly realistic results with specific free voicebanks like Tohoku Kiritan. 3. Free Resources for Owners UTAU is a free, open-source-like (but not open-source)