Fresh off the launch of its Steam rival, Epic Games isn't done shaking up the industry. Next up, it's giving away the toolkit that helped turn Fortnite into the year's biggest success story. Starting in 2019, Epic will make its cross-platform SDK -- the same tech that allows for battle royale action across PC, consoles and mobile -- available for free to all developers. Features include the ability to run parties, matchmaking, voice chat, and more across PC, Mac, Xbox One, PlayStation 4, Nintendo Switch, iOS, and Android. The cross-platform toolkit also works with Epic's own Unreal Engine and rival Unity's software.