gEDA Project

The gEDA project has produced and continues working on a full GPL'd suite and toolkit of Electronic Design Automation tools. These tools are used for electrical circuit design, schematic capture, simulation, prototyping, and production.

Free Open Source Linux

CircuitLab

Sketch, simulate, and share your circuits, entirely in your browser -- no install required. Easy schematic capture and powerful SPICE-like, mixed-mode circuit simulation...

Commercial Web

Circuit Tree

Circuit Tree is a powerful, hardware design engine. FEATURES - Fully-automated electronic design capabilities - Design a custom, unique schematic solution in less...

Free Personal Web

ModelSim

ModelSim-Altera Software

Freemium Windows Linux