Hey guys, long time no post.
Don't know if you're aware of this promo, but it seems to be for a limited time: dazstudio 4 pro, bryce 7 pro and hexagon 2.5, all commercial-grade software, free:
I've used bryce to generate skyboxes for Leadwerks, and it works great. Hexagon seems like a good modeler but I have't tried it yet, and Daz studio pro seems like a great character-posing software. Anyway, they're free and they seem like a good add-on to any artist's 3d arsenal.