ponysay
ponysay is a cowsay wrapper that is written solely for ponies.
It depends on cowsay for obvious reasons.
FAQ
Q: The output looks like a mess in (TTY/PuTTY/other)!
A: Unfortunately, there's nothing we can do about it. It's just a problem with cowsay itself.
Q: You are missing [my-favourite-pony]!
A: Ask and we'll add!
Q: Which programs do you use to generate the pony files?
A: The pony files are actually browser ponies that are generated into cow files via img2xterm.