From Parametric Technology:
Creo Elements/Direct Modeling Express 4.0, a 3D CAD system you can use to create assemblies with up to 60 parts. Easily incorporate last-minute changes into your product design with all the flexibility of the direct modeling approach. Capture your design intentions without investing hours in planning. You can even create associative drawings and analyze design ideas fast. Creo Elements/Direct Modeling Express helps any engineer, designer, or student experience the extraordinary simplicity of a direct modeling approach to 3D product development, the cornerstone of the Creo Elements/Direct product family. Even the most casual user or hobbyist will get up to speed quickly with quickstart projects, online help, and user forums. If you're a CAD professional who's currently using another CAD system, you'll find our professional CAD software more flexible than you may have thought possible.