KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...
Fritzing - Fritzing is an open-source initiative to support designers, artists, researchers and hobbyists to...
Virtual Breadboard - It is a circuit simulator on a virtual breadboard.
LTspice - LTspice® is a high performance SPICE simulation software, schematic capture and waveform viewer with enhancements and models for easing the simulation of analog circuits.
Autodesk EAGLE - Autodesk EAGLE is an electronic design automation (EDA) software.