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simavr - a lean and mean Atmel AVR simulator for linux
Pspice - OrCAD PSpice technology provides the best, high-performance circuit simulation to analyze and refine your circuits, components, and parameters before committing to layout and fabrication
Oregano - oregano - An electrical engineering tool for GNOME
Yenka - Yenka is a new generation of educational modelling tools from Crocodile Clips.
BlackBoard Circuit Designer - Help building prototypes on so called breadboards easily
Xyce - Xyce is an open source, SPICE-compatible, high-performance analog circuit simulator, capable of solving extremely large circuit problems by supporting large-scale parallel computing platforms.