FreeCAD -

ThanCad is an n-dimensional cad, with raster inclusion capability and emphasis in engineering. It is being written in Python and since it uses the Tkinter library, it is platform independent! It is also easy to translate it to various languages

AllyCAD is a powerful and user-friendly 2D CAD package that has established itself as the best of its breed. A wide range of Engineers, Surveyors, Contractors, Architects, Designers, Manufacturers, Event Management Consultants, Property Developers and even Air-conditioning companies rely on its strength and renowned ease-of-use. AllyCAD places all the draughting functionality that you need at your fingertips, allowing you to design the way you want to! In short, we have designed the program to work the way you do, intuitively and naturally.

TigerCad is a lightweight and easy to use technical drawing utility. Ideal for garden design, mechanical engineering drawings, electrical / electronic, building and room plans and general diagramming. Output in PDF format for the web.Copy and paste graphics. Create standard symbols to re-use. Scale, mirror and rotate. Accurate scale drawing printing. Drafting tools to compare with pro packages. Unfortunatelly - not any import!