a parametric 3D CAD modeler
Open Source Solid Modeling CAD
Cross-platform Open-source 2D CAD
Model Railway CAD program
An interactive viewer for three-dimensional chemical structures.
Static and Dynamic Structural Analysis of 2D and 3D frames.
Draw vector graphics to scale using a descriptive language
Software for electromagnetic simulation
A canvas library for generating technical drawings
OpenNum lets you distribute solvers with a nice graphical interface
An EnergyPlus shell for parametric studies and more ...
Precise gear geometry generator for spur and helical gears
Linux tiny CAD for educational purposes
Gphoton in a simple 3d modeler and ray tracer.
COPanno optimizes the panels cuts.
Free multiphysics simulation software package