Open Source CAD Applications
"Two open source 2D CAD packages already under development, QCAD (http://www.qcad.org) and FreeDraft (http://freeengineer.org/Freedraft/index.html). Unfortunately, Open Source solid modeling software does not exist at this time, but there may be light at the end of the tunnel. OpenCascade (http://www.opencascade.org) is a project to develop a solid modeling kernel. An open source solid modeling kernel might establish a standard file format that can be exchanged in collaborative open design projects. Until a standard file format or Open Source solid modeling exists, open design must depend on translation tools using prescribed processes [Kiani] and proprietary CAD systems.
Other tools for office documents and analyses are readily available and mature. These tools include complete suites of office applications (e.g. word processing, spreadsheets, presentations) such as OpenOffice, and numerical programming tools such as SciLab (http://www-rocq.inria.fr/scilab/) and Octave (http://www.octave.org/). Although these applications were not developed specifically for design purposes, they suit designers needs. These applications are Open Source, so the opportunity exists to adapt them to the specific needs of the Open Design community." (http://www.opendesign.org/CHIRP_Open_Design_Mfg_Equipment.pdf)