Here are some free ones aswell with the "basic" sounds. http://freemusicsoftware.org/category/free-vst/mellotron
As I remember tapeworm sucked, but the other two had good sounds. One had a good flute and string sound and the other one a good choir if I remember right.
this. tried it out yesterday, awesome program but for some reason, ableton live won't recognize the plugin file (even after updating live to the latest version and rescanning my VST folder) but it works as a standalone program.