Which PCB software for Linux? Опции

[grujic]

Which PCB software is best on Linux platform, for medium size designs?
Both open source and commercial?

[grujic]

Thank you for extensive answers.
I have seen Allegro "in action" and it seems that it's too complex, i.e. it takes a lot of work to setup a design, or I don't know how to do it efficiently.
Is it the same for Mentor Expedition? Or is it easier to setup and use?