LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
XCircuit - XCircuit: Home Page
JumboCAD EDA - JumboCAD EDA contains 3 packages, Schematic Capture, PCB designer and Library Editor.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
JSchem - Free Cross-Platform Schematic Editor
Splan - sPlan is a software to design your schematic circuit diagrams.