Kactus2 is a graphical EDA tool based on the IP-XACT standard.
Integrated Development Environment (IDE) for learning HDL
This software is a tool for designing electronic circuits using LaTeX.
Optimer: a SPICE base electrical/ electronic circuit optimization tool
kicad StepUp allows exporting kicad 3D board and comps in STEP AP214
Kicad shematic library manager
is a Qt program to generate SMD chip shooter code
Labcoat; the VHDL graphic emulator.