When I began my career as an assistant architect 12 years ago, I used AutoCAD R12, 3D Studio, CorelDraw 6.0, and Photoshop 4.0 for architectural drawing and 3-D modeling. Today, many architects still use their later versions, but those bulky packages provide many functions an architect will never use. Luckily, there are several open source alternatives that are well-suited for architects -- QCad in place of AutoCAD, Blender instead of 3DMax, Inkscape in place of CorelDraw, and the GIMP as a substitute for Photoshop.