Half-Life 2. Counterstrike: Source. Team Fortress 2. Left 4 Dead. Portal. Besides being developed by Valve, what else do those games share? They all run on the company's Source Engine that's been used since the first two released 11 years ago. Well, Valve has a new engine coming, officially, and it's aptly dubbed Source 2. Valve says that the focus of the engine this time 'round is "increasing creator productivity." The idea is to democratize game development and make it easier for amateurs (and budding indies) to use the toolset and enable them to, as Valve tells it, participate in the creation and development of their favorite games. In fact, the company specifically calls out the importance of user-generated content as a reason for making the engine easier to work with, which, undoubtedly plays into the millions of dollars its paying out to Steam Workshop creators.