VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...
FidoCADJ - FidoCadJ is a free user-friendly vector graphic editor for Mac OS X, Linux, Windows and Android.
Virtual Breadboard - It is a circuit simulator on a virtual breadboard.
XCircuit - XCircuit: Home Page
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
JumboCAD EDA - JumboCAD EDA contains 3 packages, Schematic Capture, PCB designer and Library Editor.