Free chess explorer?

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jjthenoob

So, I'm a below average player and I teach at a high school. None of the other teachers play chess, not really. So in response to many students asking me to, I started a chess club. It's in a primitive stage, so I have no money to spend yet. Is there a good free program out there that works like the chess explorer on Chess.com? I just need something so I can show them some basic tactics, teach a little notation, etc. Any help is appreciated.