Dune 2 is a Westwood Studios game put together back in 1992, and it's probably best known for being the prototypical RTS, one of the first games to put together all of the elements that later led to the genre that made StarCraftand Command & Conquer so popular. An open-source recreation of the game was started up a few years ago, and that version has now been ported to HTML 5, which means the original can now be played online in your browser.
This version is authentic, but t's obviously not as easy or user-friendly as you might expect from a more modern real-time strategy game. It's a nice trip down memory lane, or maybe just a free introduction to a piece of PC gaming history.