Several different ways to do the same thing

You may have noticed that,while using a CAD program, there are several ways to get to the same result. Also different programs use different techniques to get to the same result. What's the point of this post ? To prove that CAD is much more than a single program or only one drawing technique. Let's create a very simple 3D object, a pipe with 100mm height,outer diameter 20mm, inner diameter 15mm, by several different ways and programs.

(Almost an) Application Review: Graphite One 3D CAD

GraphiteOne is a 3D Parametric Solid Modeler. It uses the Parasolid kernel which is used also in various well known similar packages such as NX or Solidworks.
GraphiteOne provides packages for various Linux distros: Ubuntu, PCLinuxOS, OpenSUSE, CentOS.

A full list is available here. 

30-days trial versions are available with no registration.