Kicad-pcb.org
And I, for one, welcome our new robotic overlords
Help and tutorials about KiCad, the free, multi-platform printed circuit design tool.
Electrical Engineering Projects
Professional PCB Library parts, configurable / dynamic parts automated from a neutral format.
Open source EDA / electronics CAD software for Windows, macOS and Linux. Use schematic capture, create PCB designs and view them in 3D, all forever free.
Use GerbLook to view your PCB design online for free. No download required. Upload your Gerber 274x files and select solder mask, silkscreen and copper colors to generate an image of your layout as a manufactured circuit board.