Specifically designed for developing electronic circuits we may have a look at the collection of tools from the gEDA collection of tools:

Currently, the gEDA project offers a mature suite of free software applications for electronics design, including schematic capture, attribute management, bill of materials (BOM) generation, netlisting into over 20 netlist formats, analog and digital simulation, and printed circuit board (PCB) layout.^{from release notes}

See also the gEDA project homepage.