The Battle for Wesnoth is a turn-based tactical strategy game with a fantasy theme. Portable version is also available.

Freeciv is an Open Source empire-building strategy game for Windows and Linux inspired by human civilization's history. There is also a portable version available.

Freeciv Portable is an exciting and engaging Open Source empire-building strategy game. Available as an installer and for Linux.

The Battle for Wesnoth Portable is a turn-based tactical strategy game with a fantasy theme. Installer, Linux, and Mac versions are also available.

FreeCol is a turn-based strategy game based on the old game Colonization, similar to Civilization. The objective of the game is to create an independent nation.

TripleA is a free online turn-based strategy game and board game engine, similar to Axis & Allies or Risk.

Mindustry is a tower-defense sandbox factory game. Build supply chains of conveyor belts to fuel your turrets, produce building materials, and defend your structures from waves of enemies.

VOVSOFT Match Pairs is a fun little memory game that requires you to match up pairs of cards.

StarCraft is a military science fiction media franchise set at the beginning of the 26th century, centering on a galactic struggle for dominance between four species.

Seven Kingdoms: Ancient Adversaries is a real-time strategy (RTS) game that enables players to compete against up to six other kingdoms allowing players to conquer opponents by defeating them in war (with troops or machines), capturing their buildings with spies, or offering opponents money for their kingdom.

Open General is an intense strategy game that is an evolution of the popular SSI Panzer General II.

0 A.D. is an open-source, historical Real-Time Strategy (RTS) game where you have to gather the resources you need to raise a military force and dominate your enemies.

FreeOrion is a free, Open Source, turn-based space empire and galactic conquest game inspired by the tradition of the Master of Orion games.

Krush Kill 'n Destroy 2 Lite is an updated version of KKnD2: Krossfire, the sequel to KKnD in 1998 for Windows and PlayStation in 1999.

Master of Tactics is a fast-moving, action-packed turn-based space strategy game. Strategize the colonization of new worlds while exploring the galaxy.

FreeMars is an Open Source, turn-based strategy game about colonizing Mars.

Robot Rush tasks you with navigating multiple obstacles, jumping across platforms and avoiding traps as quickly as possible to save your planet.

The Days After Christmas takes place a week after Christmas and you find yourself alone at the location of a Christmas house party but no one is there and you want your promised gift.

Super Space Cadet is a retro turn-based, text/console strategy game reminiscent of games like Super Star Trek.

Hacker is a free game where you hack your way through the security software and defeat your enemies.

Spider Planet is a real-time strategy game where all players are spider-like robots in 2318 after a third world war has brought great destruction.

Fortify is a strategy game with a tower defense feel. Defend your castle from attacking monsters and siege weapons by using ranged and melee defenders, catapults, cannons, oil fields and more.

Gigalomania is an open source 2D Real Time Strategy god game where you learn technologies while traveling through various ages.

Tanks Of Freedom is a classic turn-based strategy game with two armies fighting against each other done in 32x32 pixel sprites.

Deep Space Fire is a fun strategy game based on the Milton Bradley Battleship game. Build up your space fleet and wage war against the machine in ten separate campaigns.