Plugins

Pitch Tracer - Zteer

• Lets you draw pitch bend lines

Humanizer - Minato

• Lets you randomize modulation on different notes

AutoCVVC - Zteer

• Makes a .ust into CVVC format to fit voicebanks that are CVVC (Japanese)

Iroiro2 - bizz

• Queen of plugins, conversion files

UtaFormatix 

• Website rather than plugin, lets you convert vocal synth project files to other formats.