LibreCAD is an open source community-project that is open to new ideas and is used by a large user community completely free of cost. The program has a built-in help system that can help you get started and communicate with other LibreCAD users.
For those who may not know, CAD, or computer-aided design, is technology that allows the user to make spectacular designs.
LibreCAD is compatible with Windows, Mac OS X and Linux among other operating systems.