KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Proteus PCB design - Proteus PCB design combines the schematic capture and ARES PCB layout programs to provide a...
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
upverter - Upverter makes it easy to design and share electronics on the web.
EasyEDA - EasyEDA - Web-based EDA suite; runs in browser.
Ktechlab - KTechLab is an IDE for microcontrollers and electronics.