3d Modeling (free)
Blender
Blender is a free and open-source 3D computer graphics software product used for creating animated films, visual effects, interactive 3D applications or video games. Blender's features include 3D modeling, UV unwrapping, texturing, rigging and skinning, fluid and smoke simulation, particle simulation, animating, rendering, video editing and compositing.
Wings3D
"Wings 3D is an advanced subdivision modeler. Wings 3D is open source and completely free for use in both personal and commercial projects. Wings 3D offers a wide range of modeling tools, a customizable interface, support for lights and materials, and a built-in AutoUV mapping facility.There is no support in Wings for animation. "
MilkShape
MilkShape 3D is a low-polygon modeler, which includes basic operations like select, move, rotate, scale, extrude, turn edge, and subdivide. MilkShape 3D also allows low-level editing with the vertex and face tool. Standard and extended primitives like spheres, boxes, cylinders, etc. are available too. MilkShape 3D also supports skeletal animation.
SketchUP
You can build models from scratch, or you can download what you need. People all over the world share what they've made on the Google 3D Warehouse. Redecorate your living room. Invent a new piece of furniture. Model your city for Google Earth. There's no limit to what you can create with SketchUp.
123d
Autodesk 123D is a hobbyist CAD and modelling tool created by Autodesk. It is similar in scope to Google Sketchup and based upon Autodesk's Inventor product range. As well as the more basic drawing and modelling capabilities it also has assembly and constraint support and STL export. Available for the software is also a library of ready-made blocks and objects.
GMax
Gmax is a 3D modeling application based on Autodesk's 3ds Max application used by professional computer graphics artists. Whereas 3ds Max is a comprehensive modeling, animation, and rendering package with some secondary post-production and compositing features, Gmax is much more limited due to its singular intended use—game content creation.
Free
