I wondered if someone would go there. The OP sounds like he is looking for *simple*.
...even from (bootable) optical media (i.e. without installing):
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gEDA (GNU Electronic Design Automation) is another (GPL'd) package in this (powerful) class. Windoze binaries not available any longer; Dan McMahill maintains a build script for getting it going under Windoze.
The Linux distros mentioned above also contain gEDA.
...and before someone applauds Cadsoft's non-free DRM'd crippleware demo:
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