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circuits.io - http://www.circuits.io/
Free circuit editor in your browser ‎- ati
Not just circuits; PCBs, too! ‎- 9000
Yep, very clean and functional. No autotracing, though. ‎- ati
Autotracing on the server side would be expensive. Autotracing in browser... well, crazy enough, but should appear eventually, according to Atwood Law. ‎- 9000