Salvation Prophecy is a space epic. Four warring factions battle over control of the known galaxy. Space stations and planet colonies endure constant assault. You begin your journey as a soldier recruit. Through intense planet and space battle, your combat skills will be put to a grim test. Success is rewarded with powerful skills, combat gear, and ship upgrades, and you may rise in rank to become commander of your faction. Lurking in the dark recesses of the universe is a threat foreseen by an apocalyptic prophecy. A danger far greater than mankind's endless battles. The pursuit of the prophecy leads through distant alien worlds with deadly creatures and untold secrets. A chance for redemption, if only we find our way through that dark hour.
I can't hardly find matching games from the entire variety produced by fat publishers, and if I do - I can count them with one hand. This piece of art definitely deserves highest rank among others. Diverse possibilities presented by author can satisfy various tastes, from straight action to strategic planning of missions, to character developing in classical RPG style.
Not to mention detailed workings with engine - textures, models, shaders & particles; with gameplay - sounds, texts, layout and plot; controls - keyboard, joystick, mouse, gamepad...
Final blow is a linux support - I just cannot miss this fact and apparently among linux games this one is a top.