Advanced Strategic Command - A turn based strategy game for Linux or Windows. (Open Source)

Attal: Lords of Doom - Turn-based strategy game for Linux in which you control bases and manage fighting lords.

Babala - Logic game using mines to defeat computer controlled players. Includes client download and instructions with screenshots.
Meta Description: [ Babala, a unique and challenging free puzzle game for ages 7-70, never a time constraint, a test of wits not reflexes; 200 levels ]

500 Boa game - A multi-player clone of the worm(6). Includes, server, client, and bot. Source can be compiled for SGI, Linux, Sun or Gnuwin32.

Boson - A real-time Linux strategy game for two players. (Open Source, GNU GPL)
Meta Description: [ Boson is a free real-time strategy game for KDE ]

C-evo - Turn-based empire building strategy game for Windows. (Open Source)
Meta Description: [ C-evo is a freeware empire building game for Windows ]

Castle Combat - A clone of Rampart for Linux. Two players build castle walls, place cannons inside these walls, and shoot at the walls of their enemies.

CivQuest - Turn-based Civilization clone written in Java. (Open Source, GNU GPL)

Constellation! - Constellation is a 2D turn-based pure-multiplayer strategy / combat game for Windows with a space theme. Well suited to be played by email.

Continents - Turn based sprites with random map generation and sound.
Meta Description: [ Continents Strategy PC Game ]

Crimson Fields - Describes tactical war game for Linux or FreeBSD in the tradition of Battle Isle. Two players command their units on a map of hexagons, trying to defend important locations to destroy all enemy forces. (Open Source)

Crown and Cutlass - A 3D pirate game in the spirit of the old Pirates! game.
Meta Description: [ Crown and Cutlass is a free (open source) 3d pirate action/adventure game in the spirit of the old Pirates! game. ]

Cult - Using negotiation and trade, one must resolve a situation involving cultists barricaded in a villa two kilometers away from town. (Windows)

Emperor of the Fading Suns: Hyperion - A patch by Matt Caspermeyer for the turn-based game. Includes download, documentation, tutorials, and a forum.

FreeRails - Multiplayer real-time strategy game inspired by Railroad Tycoon and Railroad Tycoon II. Written in both C++ and Java. (Open Source, GNU GPL)

Glest - Single player, 3D, realtime strategy for Windows with up to three computer opponents.
Meta Description: [ A free 3d real time strategy project (RTS), Proyecto libre de estrategia en tiempo real (RTS). ]

L-O-C - Turn-based strategy game with some strong RPG elements, based on a game by Julian Gollop. Runs under MS-DOS, Windows and Linux by using an Atari emulator. (Open Source, GNU GPL)

Lazer Squad 3D - Screenshots, mission back-stories, and downloads for the two player contest for Java.

Marbles - Create figures out of single marbles. One-way streets, crumbling walls and portals make the task interesting. (Linux)

Overlord '44 - Overlord '44 is a 3D real-time strategy game about the D-Day landings. You will command either the Allies trying to get further inland or the Axis trying to repel the Allies.
Meta Description: [ The Official Site for the Overlord '44 Game about the D-Day Landings. ]

Phobia III - Choose your weapon and tactics to slaughter as many of the aliens that swarm you as possible. Features stunning graphics for Windows or Linux.

Pizza Business - Control pizza restaurants, limited to a budget. Includes downloads and news.
Meta Description: [ Pizza Business Website ]

Planetasia - Space strategy game for Windows.
Meta Description: [ Planetasia: A new strategy game that is Free to download. ]

Pocket Civ - Turn-based Civilization clone for Palm OS.

SantaGames.co.uk - Contains Santa's Snowy Workshop available for download. [Windows All]
Meta Description: [ Fun Christmas Game downloads. Help santa's workshops run smoothly up to xmas. ]

Scorched Island 3D - Combines tactics from popular game Scorch and elements from RPG games for DOS or Linux.

The Battle for Wesnoth - A turn-based game with a fantasy theme. Includes download, project information, FAQs and manual, screenshots, and a forum. (Linux, Mac OS X, Windows)

404 The Colonization II Project - Project to create an alternative sequel to the turn-based strategy game Colonization by Sid Meier.

500 The General - Turned based military strategy game for Windows in which you control a nation. Your goal is to unite the world under your rule, upon conquering all the other states.

Trackballs - Marble simulation based on the 80's classic Marble Madness. You steer a marble through obstacles to finish level on Linux or Windows. [Open source, GPL]

UFO 2000 - A multiplayer remake of X-COM: UFO Defense for Windows. (Open Source)