Pretty much all of them. They call it "Hyper Animation Series" to drive home that it's not like those visual novels that rely heavily on CG stills. Almost every scene in every game is animated to some degree, and every character is voiced, with the exception of the male protagonists in the earlier games because you're supposed to supply your own face/voice for those characters.
Just the flash-based games later in the series like GT1 and Viper Islands lacked voices as far as I know, and had less animation.