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Paul Falstad's Java applets were my biggest regret about deciding to uninstall it.

Somebody ported the circuit simulator to JavaScript: http://lushprojects.com/circuitjs/

Wow, I didn't know them before. Cool stuff!!

PS. I entered with my android mobile and to my surprise it works... Another thing I was not aware is that I have Java applets on by default...

Android doesn't support Java applets. The site uses JS.