I operate the Unity Asset Store for Unity Technologies, creators of the Unity Game Engine (www.unity3d.com).
In a nutshell, we have this repository for game developers. I'm looking for artists, sound designers,3D modellers or potential repository partners who'd like to sell their work on the store. You get 70% of every sale, and it's right in the Unity game development environment. Free stuff is welcome too and good for exposure, which may be distributed as Creative Commons Attribution, or Public Domain.
Here's how to do it.. unity3d.com/unity/editor/asset-store-submit
Feel free to email email@example.com if you need anything.