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
XCircuit - XCircuit: Home Page
Polymer - Polymer is a library that uses the latest web technologies to let you create custom HTML elements.
JSchem - Free Cross-Platform Schematic Editor