Gomoku.app is an extended TicTacToe game for GNUstep. You win the game if you are able to put 5 of your pieces in a row, column, or diagonal. You lose if the computer does so before you. You can play the game on boards of different size. The game has 6 different difficulty levels.
Phage is a two-player abstract strategy game. It is somewhat similar to chess, in that each player has different-looking pieces that move in different ways. A game of Phage is finite: there is a fixed upper limit on the moves that can be performed, so games are usually quite short.