Blender is an open source 3D modeling tool (and game authoring environment) that is available on most platforms. To be honest, it can be pretty tricky to figure out but is really amazing. For my work I model software boxes in Blender for use on our website.
Migration Score
GREAT
Migration Options
Native Version Available
Just keep working.
How Good is the Linux App?
App name should be marketable
Has a nice app icon
Uses Tango icon guidelines
Slick UI that's fun to use
Killer feature people talk about
Good-looking website
Top-level domain name
Site has FAQs for users
Site has a User forum
Site has a way to contact the developers
Packages for Ubuntu, Fedora, and openSUSE