SketchUp - 3D for Everyone
LabVIEW - LabVIEW offers many of the functions you'd find in a traditional script-based programming language presented in a more intuitive visual interface ideal fo engineering.
LibreCAD - An open source 2D CAD application for Windows, Apple and Linux.
PyLab_Works - PyLab_Works is a free and open source replacement for LabView + MatLab, written in pure Python.
DraftSight - Discover Dassault Systèmes®' DRAFTSIGHT™ Professional CAD software that lets you create, edit, view and markup any kind of 2D drawing. Learn more here.
itom - itom is an open source software suite for operating measurement systems, laboratory automation and...