Gottardo Zancani has posted the first release in his free Space Infantry solo sci-fi game.
From his website:
Space Infantry (SI) is a free, solitaire game of squad-level combat in the future. In Space Infantry you control a team of 4/8 soldiers on a series of missions that can be played individually or as a campaign.
Each mission takes about 20 minutes to be completed.
SI is a modular game; the overall structure of SI will make possible to easily add new features to the game (missions, enemies, equipment): this means that in the future additional components will add new options to the existing missions, increasing the lifetime of SI.