Ghosthande wrote:
Blender's neither expensive or difficult to obtain, and it handles a really wide array of filetypes, including those used by 3D games (including Sims 2).

Since adding mod-ability would be an intentional effort on Fishing Cactus's part, it would make zero sense for them to go out of their way and put time and money into making a system where only .01% of the fanbase will be able to make anything. Nobody would benefit. I think it's safe to say that whatever the requirements would be for third-party modders, they wouldn't be something as absurd as Maya. But Blender seems like it would be a fairly likely candidate.

"Despite the free-to-play nature of #Creatures and the obvious implications of that on the "opening the game" to the community, we would love in the future to get around to having some form of support of user-created content. We've always been straightforward about the fact that when the game is released we will hear the community about the direction it wants the game to go to. All options are open really (for instance we've thought about the "team fortress" kind of moderated user generated content) but ultimately the evolution will likely follow the will of the community. It's hard for us to bet on support for modding that will maybe only interest 1% of the players considering we don't have the resource to be as big as, say, Little Big Planet. We'll gladly do it though if we see there's an overwhelming number of players that want it"