VeroRoute - Cross-platform software for producing Veroboard (stripboard), Perfboard, and single-sided PCB...
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.
Virtual Breadboard - It is a circuit simulator on a virtual breadboard.
Circuit Simulator - Animated electronic circuit simulator using ideal components to visualize voltage and current.
KiCad - A Cross Platform and Open Source Electronics Design Automation Suite
Solve Elec - Solve Elec is a free educational program to draw and analyze electrical circuits.