CA2DS is a project by Dement, consisting of a conversion of the entire Creatures Adventures world to make it playable in Docking Station (similar to C12DS). Currently only Dement is working on it. All the metarooms have been completed, as well as about a fifth of the agents.
Please note that in order to download and use CA2DS, you need to own a copy of Creatures Adventures.
Dementopia has screenshots of the project available. Beta releases of the breeds are out as well. (Link down)