Software identification of a DIY (guitarist) CAD application
It happened again (just after searching for at least half an hour), I find it within 5 minutes after posting the question.

Anyway I found the application:

It's called DIY Layout Creator.

Link:

http://diy-fever.com/software/diylc/

(In case you think it's advertisement: if you are serious about electronics, most are here, use a 'real' CAD application like KiCad, Altium etc).