LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
XCircuit - XCircuit: Home Page
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Splan - sPlan is a software to design your schematic circuit diagrams.
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
JSchem - Free Cross-Platform Schematic Editor