http://speciesdevblog.wordpress.com/ Blogs
It's has a release but there are some problems with it. It is being actively worked on, and is in it's alpha stage.
If you do join the forums and want to watch the development, mention that Icefire recommended you ;D
The game is basically a simulation of life in a three dimensional enviroment. Currently the graphics aren't spectacular but they will be polished, I believe, once that some of the kinks in the gameplay is worked out. All of the creatures start out as nothing more than slug type things, but over time they mutate and evolve legs and horns, arms, tails, you name it. They can travel around the map and inhabit new areas of forest. They eat the trees, but some are carnivores/omnivores or are just aggressive and attack others. The carnivores/omnivores may eat the corpses left behind.
Also, there is a mod maker, (not literal mods, that is just the name) where you can create your own your own creature.
It is still very early in development, it's current release is it's first. Look into it if you are interested
