3DCrafter: 3DCrafter is a real-time 3D modeling and animation tool that incorporates an intuitive drag-and-drop approach to 3D modeling.
Blender: Blender is a free and open source 3D animation suite. It supports the entirety of the 3D pipeline—modeling, rigging, animation, simulation, rendering, compositing and motion tracking and even video editing. 2-D animation is also possible using Grease Pencil. It's great for replacement mouth parts that you 3D print and to create character designs in.
Sketchup: There’s a reason SketchUp is synonymous with friendly and forgiving 3D modeling software: we don’t sacrifice usability for the sake of functionality. Start by drawing lines and shapes. Push and pull surfaces to turn them into 3D forms. Stretch, copy, rotate and paint to make anything you like. If you want to be productive within a couple of hours, you’ve come to the right place.
Shapeways (printing service): Create high-quality 3D prints in over 30 materials. Products are made to order and delivered wherever you are in the world.
I.Materialise: i.materialise is an online 3D printing service for all people with an eye for design and a head full of ideas. Turn your ideas into 3D printed reality.Create, share, and sell your designs with i.materialise.
Sculpteo: Sculpteo helps people and businesses buy, sell and 3D print ideas as solid objects.
ZBrush Core Mini: This free software provides an excellent gateway into the exciting world of 3D. It's features are easy to learn, even for someone with no experience in digital art, yet robust enough for creating base models that can then be refined in other applications, such as ZBrush.
Ponoko: Print your objects out of 80+ materials.
Alibre: Geomagic Design 3D CAD software provides end-to-end design and manufacturing solutions.
Custom Prototypes (Toronto Canada): A 3D printing service company that provides 3D printing, CNC, Vacuum forming and prototypes.
Fusion 360: Fusion 360TM is the first 3D CAD, CAM, and CAE tool of its kind. It connects your entire product development process in a single cloud-based platform that works on both Mac and PC.
Tinkercad: Tinkercad is a free 3D and modeling program that is web based. It's a great tool for making 3D printed armature parts.
ZBrush: A pro sculpting tool that can be used in conjunction with 3D printing for organic and hard surface models. It's the tool of choice for stop motion studios that create replacement mouths for their puppets.