Model Railway CAD program
A Cross Platform and Open Source Electronics Design Automation Suite
Free and open source pattern design software
KiCad EDA Suite in PortableApps.com format
Convert any image to gerber and drill files
A software package for processing and analyzing chemical trajectories
Arduino Focuser, fully ASCOM complaint
Draw vector graphics to scale using a descriptive language
Simple Road Design and Earthworks
Dew Controller Feature Rich
Component, CA, and CCA models; superdense time, DB repo, testing, etc.
HMI - SCADA Graphics Visualization Source Code Solution For C/C++
Toolboxes for parameter continuation and bifurcation analysis.
Open source Matlab code for nonlinear isogeometric analysis
A set of freeware applications for viewing/processing P-CAD files.
Open source 3D software based on opencascade(CAD)
E-XD++ Diagram Control for C/C++, .NET, the professional Diagram.
2D CAD for precise drawing
Extensible Line-drawing & Polygon-filling Rasterization Libs for Java
Paint brush program which you can draw objects, Object Painter
PCR primers / probes design from multiple & degenerate sequences
Program to design crosswords
SOLVESPACE is a free (GPLv3) parametric 3d CAD tool.