We mentioned the current Steam sale on Guns of Icarus Online last night, but failed to mention that this is in part to celebrate the release of a Linux edition of the strategic airship shooter. Word is: "Guns of Icarus Online is the first co-operative airship combat game mixing together first-person shooter action with team-based strategy. Up to four people will crew a ship, taking on one of the key roles of Captain, Gunner, or Engineer joining a team and fighting against other ships above the post-apocalyptic waste. In Guns of Icarus Online, it will take teamwork and tactics to dominate the skies."