Tools
SetParam
By nwp8861. For configuring the oto.ini.
OREMO
By nwp8861. For recording UTAU voicebanks.
akorin
By KLAD. Crossplatform OREMO alternative. For OSes other than Windows, you must build it from source.
WavConfigTool
By Heiden.BZR. For configuring the oto.ini.
Speedwagon
By Custom.Maid. Software for quickly regenerating frqs.
mkototemp (MakeOtoTemp)
By Delta. Automatically generates oto.ini for CVVC voicebanks. May require configuration.
VocalShifter
By Ackie Sound. Vocal editor that can edit pitch, DYN(Dynamics), formant, pan, timing, etc.