A free weekend is now underway for ORION: Dino Horde on Steam, odd timing for this promotion for the dinosaur shooter considering a is also underway for the similar Primal Carnage. Here's word from Steam News:

Play ORION: Dino Horde for FREE starting now through Sunday at 1PM Pacific Time and save 25% until Monday at 10am pacific.

If you already have Steam installed, click here to install or play. If you don't have Steam, you can download it here.

‘ORION: Dino Horde’ is an indie Sci-Fi shooter (FPS/TPS) that puts you and your friends together into intense, cinematic battles using some of the most incredible weaponry and amazing vehicles in which you must work or compete against one another to accomplish mission objectives, explore giant worlds and survive the devastating Dinosaur Horde.