Category listing - cad
chipmunk electronic CAD system
geda-gaf suite of tools for electronic design automation
gerbv viewer for Gerber (RS-274X) files
gnucap Gnu Circuit Analysis Package
gtkwave GTK+-based electronic waveform viewer
kicad circuit drawing and schematic capture
klogic logic circuit simulator for KDE
necpp NEC2++ antenna simulator
pcb printed circuit board layout tool
qcad Qt-based 2D CAD system
spice Simulation Program for Integrated Circuit Electronics
xcircuit circuit drawing and schematic capture
xnecview NEC2 antenna simulator visualizer