Hedgewars - Hedgewars is a Free to play, Single-player and Turn-based Strategy video game developed by Hedgewars Development Team.
TripleA - TripleA is a free (under GPL) turn based strategy game based on Axis & Allies board game.
Counter-Strike 2D - Top-Down Multiplayer Shooter
Puzzle Strike - Puzzle Strike is a Puzzle, Board, Single and Multiplayer video game created and published by Sirlin Games.
Ironfell - Ironfell is a time travel themed massive multi-player online real time strategy game.
Lux Delux - Lux Delux is a game of strategy and domination inspired by the board game Risk.