The Steam Summer Sale has started and the forth day now features four games with Linux support, or at least that will receive it the future.
The third day of the Steam Summer sale has been very disappointing for Linux users, but the fourth day features three games that should provide enough entertainment.
Kerbal Space Program features a physics-based Space Flight Simulation engine, the ability to fly to the Moon and other planets, the ability to build ships with multiple stages, and much more. It's the only one in today's offer that comes with a Linux version. It has a 40% discount.
Portal 2 is a game developed by Valve and continues the action and story from the first Portal game. Players will return to face GlaDOS and to solve more complicated puzzles.
A Linux version for Portal 2 hasn't been released yet, but it's safe to say that Valve is hard at work and a port is most likely incoming. Portal 2 has 75% discount.
Eador: Masters of the Broken World is a turn-based fantasy strategy game that features beautiful graphics and a non-linear story. The developers have already announced that a Linux version is in the works, but a launch date hasn't been announced yet. The discount for this game is 40%
More details about the rest of the games available with the Steam Summer Sale can be found in the official announcement.