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FreeCAD is based on OpenCasCade, a powerful geometry kernel, features an Open Inventor-compliant 3D scene representation model provided by the Coin 3D library, and a broad Python API. The interface is built with Qt. FreeCAD runs exactly the same way on Windows, Mac OSX and Linux platforms.
FreeCAD Features
Rock-solid OpenCasCade-based geometry kernel, allowing complex 3D operations on complex shape types, and supports natively concepts like brep, nurbs, booleans operations or fillets
Full parametric model allowing any type of parameter-driven custom objects, that can even be fully programmed in python
Complete access from python built-in interpreter, macros or external scripts to almost any part of FreeCAD, being geometry creation and transformation, the 2D or 3D representation of that geometry (scenegraph) or even the FreeCAD interface
Install FreeCAD on ubuntu
Open the terminal and run the following command
sudo apt-get install freecad
If you want to install latest version run the following commands
sudo add-apt-repository ppa:freecad-maintainers/freecad-stable
sudo apt-get update
sudo apt-get install freecad
Screenshots