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LibreCAD is a free Open Source CAD application for Windows, Apple and Linux. Support and documentation is free from our large, dedicated community of users, contributors and developers. You, too, can also get involved!!

Whether you are using 2D across your company or for a specific 2D design process, Solid Edge 2D Drafting will give you an immediate advantage with production-proven capabilities including drawing layout, Goal Seeking, diagramming, and dimensioning.  It is fully compliant with ISO, ANSI, BSI, DIN, JIS and UNI, and it's absolutely FREE to download and use

A 1,200-gram weather balloon, the crucial role of gravity, quiver-reducing ropes, Styrofoam's versatility, burst altitude, a University of Wyoming website and a free software program for shutterbugs were part of the formula Mathew Ho and Asad Muhammad, both 17, used to launch, film and land the patriotic, flag-bearing Lego Man.

Design in 3D what you've always dreamed of, but never thought possible. Until now. Join the Tinkercad community and learn how to create your first real things in just a few minutes.

Use this document to check standard door dimensions. 

Dozens of types of graph paper that can be downloaded as PDFs. Invaluable for sketching and other assignments!