IronCAD is a rarity in our biz, a dual-kernel, dual-mode CAD package. It is based on Parasolid and ACIS; it does history-based and direct editing. It ought to be really popular, but it isn't. (Probably because it didn't have the marketing budgets that Dassault Systemes and Autodesk could plough into SolidWorks and Inventor.)
What would it take for you to use IronCAD, instead of another MCAD package? You probably wouldn't, but the folks at IronCAD think you should try it out, anyhow. Like any other CAD vendor, they had their 30-day free trial version, but now they are throwing out to us an all-free package: IronCAD Compose.
- Viewing IronCAD files; purchase the optional file translator, and it views files from other CAD packages
- Configuring 3D models to customer requirements
- Generating renderings and animations of 3D models
- Sharing IronCAD 3D models by many people, since Compose is free
You can get your 420MB copy from http://www.ironcad.com/index.php/support/download-products, which optionally gives you a download all of IronCAD's other software for a 30-day trial (IronCAD, Inovate, Draft, and the translator bundle).