Olitek have found some useful reference resources over the years, we thought you might find a few useful.
www.edrawingsviewer.com - Free CAD viewing tool for 2D drawings and 3D models
www.joshmadison.com/software/convert-for-windows/ - Useful Convertor for Engineers
www.solidworks.com.au - Supplier of SolidWorks® 3D CAD
www.adacad.com - Supplier of Autodesk Inventor® 3D CAD
www.leapaust.com.au - Supplier of ProEngineer® 3D CAD and Ansys® FEA Software
www.miningaustralia.com.au - Update yourself with mining information
www.matweb.com - A source for Engineering Materials data