Free OrCAD Demo program, which includes demo versions of: OrCAD Capture CIS, PSpice A/D, OrCAD Layout, and SPECCTRA for OrCAD. The limitations of this demo are in the size and complexity of the design.
Freeware program for MAC and Windows to draw and analyze electrical circuits.
Freeware open-source program for drawing circuits running on Windows. It includes drawing libraries, a SPICE template engine and can export to PCB design programs.
Open-source circuit-design program for Unix/X11.
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