This is Proset.  I don't know who invented it, but I made it into a massively multiplayer perpetual card game.

Instructions (in MathSpeak): Each card is a binary vector.  Select a set of cards by clicking on them.  If the set adds to the "zero" card, press spacebar to get a point.  You can give yourself a name in the bottom right.

Instructions (in English): Select some cards by clicking on them.  If the number of dots in each position is even, press spacebar to get a point.  Another way of seeing it, is imagine that you pile the cards you selected.  Each time two dots pile up, they cancel out.  You can give yourself a name in the bottom right.

Instructions (in Simple English):  Mash keyboard.  Hope for points.

Example of a good set:

New features and polish are coming!  Please add feature requests in the comments.  I expect to have time to add things in October.