wdb When being employed, in the nineties, for my company I drew telephones with a graphics tool ot top of Documentation Software Interleaf which nowadays is disappeared from market. The graphics tool was somehow unique as it allows magnetic-snapping of line end-dots – no zoom required.
http://www.wolf-dieter-busch.de/vectorleaf/index.htm
Because it disappeared I wrote a spirit-revival graphics tool I call Vectorleaf.
Description in German, two tutorials in German too.
Software described in English .
Watch also Gallery :
Vectorleaf is not intended as complete Graphics Suite, just close a technical gap: easy draw trade products.
Image export to SVG which can be processed by other Vector Graphics, e. g. Inkscape.