Henni's Voice Collection
Here are over 3,500 voices collected over the years from the Internet. Note that these are not YEP or YEM voices and so do not require extra memory to load. Since the collection is so large, the voices are provided in 14 subfolers labeled after the first character in the voice name: (voices 0-a, voices b, voices c, ... ,voices u-z).
You can download the entire collection in one large zip file (1.5MB):