Serious Sam 3: BFE, an FPS developed by the famous Croteam Studio, has been included in the most recent IndieRoyale Valentines Bundle 2.0.
The bundle contains a lot of other titles besides Serious Sam 3: BFE, such as Shad'O, Oozi: Earth Adventure, Doc Clock: The Toasted Sandwich of Time, Lunnye Devitsy 2013, and Wake.
Unfortunately, just Serious Sam 3: BFE comes with Linux support, and that's because users will receive a CD-key which can be activated on Steam for Linux.
The minimum price for this bundle is set at $3.50 (€2.60), but as more people buy it, the price will slowly rise.
The IndieRoyale Bundle is the main rival of the Humble Indie Bundle initiative, but fells short when it comes to Linux support because the open source platform is not really a target.