Gomoku is a board (or paper and pencil) game for 2 players typically on a 18×18 board. The winner is who gets first exactly five stones in a row (horizontal, vertical or diagonal). You can play this game online here against the implemented algorithm.
There is no copyright as we know of. So please let us know in case you have knowledge about some copyrights regarding gomoku.
Please report bugs, feature requests, questions to dev[at]vonwangelin.com. Thank you!