TimingEditor is a tool to graphically draw and edit timing diagrams.
A circuit simulator with graphical user interface (GUI)
JQM - Java Quine McCluskey for minimization of Boolean functions.
kicad StepUp allows exporting kicad 3D board and comps in STEP AP214
Mod Direct Panoramic Spectrum Analyzer
Penthode simulates, draw and plot electrical power distributions
GDS visualization and parallelized capacitance extraction
Visually build and simulate boolean logic circuits