The free games available through Steam right now are Warhammer 40,000: Gladius – Relics of War, TGV Voyages Train Simulator, Hue, and a prologue for Alone in the Dark. The only catch here is that, like most of these free or discounted offerings, the games are only free for a set amount of time with one of the deals ending as early as June 1st, though you'll have a bit of time to claim the rest of the games. The four games that are free right now are 100% free to keep and come from different studios and genres, so you'll have quite the diverse array of games to play this weekend if you claim them all. Four Steam games are free right now, and not just free-to-play for a weekend.