Circuit simulator and schematic capture tool
If you like everycircuit you should also try this circuit sim in the browser. It is really cool - especially for learning/teaching:
http://lushprojects.com/circuitjs/It was originally developed as a Java applet by Paul Falstad. As Java in the browser got more and more troublesome I modified it to work with HTML 5 for a plug-in free experience. We agreed to release the new version as GPL:
https://github.com/sharpie7/circuitjs1/network