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Falstadt (iirc) is a great web based one that is pretty easy to use. It's not as accurate as ltspice though but it's good for simple stuff.

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http://www.falstad.com/circuit/

It used to be a Java applet, now rewritten in JavaScript. Sadly, the Java version vastly outperforms the JS one, at least on my machine, but Java applets are annoying to run nowadays

The JS one is plenty performant on my machine. I love that simulator. Helps me intuitively understand the circuit when I can see the voltage and current on each connection.

I do love that you can double click on a wire and check the box to show the current/voltage there.

Try my electron wrapper:

https://github.com/Immortalin/Simulacra

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