BlockCAD is a really fun CAD program. The aim is to develop your imagination playing with virtual LEGO pieces. It includes a project editor to make your own constructions that offers up to ten different views.
The number of pieces available in BlockCAD is very high, and they come organized by category. Each piece can be rotated by up to 90 degrees. The user can save the models they build or save the images created from these models (in JPG and BMP formats). With this program you can create all types of objects: planes, helicopters, ships, missiles, etc.
BlockCAD is a free program and is controlled either from the keyboard or mouse.