This is a compiled list of all the servers that I could find that were functional and had game that you could access and play.
The more famous active servers will be first. I will also tell their pro's and cons, so you may be prepared ahead of time what they are like.
Dragon's DenPros - Updated Music, Maps, Prey, and even Campaign Updates, updated run cycle
Cons - Computer Strain
Last MoonPros - New Bodies, Heads and Tails and added Quests, updated Maps and run cycle.
Cons - Computer Strain
Wolf SoulPros - New GUI, New Model, New Animations Cycles, Awesome Music, Both Feline/Canine Models
Cons -
(As Complained by Players) Incompetent Staff
Dawn of EternityPros - Added Features, Updated Code and Features, 100% Custom Creatures
Cons - Unknown
Myatar LegendsPros - New Models, Actions and Animations
Cons - Unknown
AzoptaosPros - New and Creative, Teeth and Tongue color Modifications, New Models
Cons - Computer Strain
Impressive SpacePros - Interesting new layout
Cons - Russian Website, Installation Difficulty, DirectX Errors
Here are some games that are not IT servers like the ones above. I'll list as many as I can think of. ^-^
The Endless ForestPros - Huge Forest, Easy Download, Many AI Deer
Cons - Man Faces, No Chat System, Lag
Wolf QuestPros - Updated Version, Multiplayer w/ Friends Lists
Cons - Unknown
I, PredatorPros - Unknown
Cons - Difficult Game Play
The IslePros - Many Dinosaurs, Great Graphics
Cons - Unknown
Gluten Free GamesPros - Tons and TONS Of Animal Simulators for Cheap Price
Cons - Unknown
Fly Like A BirdPros - Many Birds + Servers
Cons - Doesn't support Google Chrome
LifPros - Many Animals, Fun
Cons - Doesn't support Google Chrome
Lif SerengetiPros - Many Animals, Fun
Cons - Doesn't support Google Chrome