Am very glad to see Cowsay on Android, nothing like those ascii animals and funny quotes. Cowsay 4 Android has a couple extra goodies, it comes with a couple different animals, can insert custom text, and the ascii art can be saved as an image, text or copied to the clipboard.
Issue Tracker: https://github.com/rorist/Cowsay-android/issues
Source Code: https://github.com/rorist/Cowsay-android
Note: Even though These Apps are Open Source it is still recommended to download them from the Google Play Store. Unless building from source Always use the official Google Play Store to keep your Android device safe and secure.