Degie Its a good tracker. The free "Trial" is good for up to 5 animals
Vyper There Free trial is only good for 30 days BUT its only $25. There currently not letting you purchase the full version as they have a new version that should be out anytime (According to you there site)
Simple Animal Tracker They are in the process of making this and Im EXTREMELY excited to see how it turns out
Iherp I havent played much with this but to me it seems like a pain if you have several animals, I know there system has crashed and I personally dont like some one to just look up all the info on my animals if they want