LibrePCB - LibrePCB is a free EDA software to develop printed circuit boards.
FidoCADJ - FidoCadJ is a free user-friendly vector graphic editor for Mac OS X, Linux, Windows and Android.
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.
OmniGlyph - Powerful and easy-to-use PCB Design package