Stellar Forces is a squad-level, turn based, multi-player strategy game. It is similar to Laser Squad or X-Com missions being multi-player across the Internet. Each player controls a squad of units and takes their turn using the client software to complete their mission and defeat their opponent. There are multiple missions available, as well as lots of different kinds of weapons and equipment. This game is completely free to play; all you need to do is register on the Web site, which then allows you to connect to other players and play as many games as you want.
Ironclad: Steam Legions is a steampunk strategy game with an AI opponent. It lets you pit your strategic skills with battle tanks, infantry, artillery, and warships against a fast thinking enemy in a hex-based battle arena. It is still under development in the alpha phase. However, the game is fully playable, with a complete set of tutorial levels to master, with sound effects.
FMG is a futuristic war game based on full metal planet (an 'old' board game) and playable in a Web browser. Land your spaceship on Full Metal Planet, pick up ore, destroy or capture the enemy expensive hardware, and if you can, capture their own freighter with a hold full to bursting. Each game is independent. Although it is playable in English, not everything in the guide is translated yet.