Pente
Five in a row game for X
Pente is the English name for the Asian game ni-nuki, which itself is a version of the game go-moku. The game is a variant of the well known five in a row. Placing five stones in a row is one way to win, the other is to capture five pairs of the opponents stones.
Pente can run in three different modes: X, curses or text. You can play against the computer or another human, and there is also support for playing over a network.