Galinstan is an alloy of gallium, indium, and tin (the Latin is stannum). It's (relatively) nontoxic and liquid at room temperature. For this reason, it's used as a mercury replacement in some applications (you can find galinstan thermometers, for example).
Unfortunately, galinstan isn't quite as cool as mercury - mercury tends to bead, while galinstan "wets" things (coats them). This makes it a mess to handle and not useful to many of the applications mercury is best at.
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Maybe not so useful, but replace the gallium with bismuth and you get a low melting point solid that has been used in such fun applications as a gag spoon that melts when you stir your coffee.