Epic Games announced its own subscription model for Unreal Engine 4 yesterday, a plan that amounts to $19 per month plus 5 percent of gross revenue from any commercial product developed with the engine. While Crytek will unveil more details about its subscription plan in the future, its announcement noted that the Engine as a Service version of CryEngine will be "royalty-free." The latest version of CryEngine features Linux support as well as "Physically Based Shading," a Geometry Cache feature to calculate cache-based animations for elements like cloth and fluid dynamics and an image-based lighting system.
An alternative to these subscriptions for some independent developers are middleware development tools like GameMaker: Studio and MonoGame. Sony announced PS4 exporting solutions for those pieces of development software yesterday in addition to PS3, Vita and upcoming PS4 solutions for Unity users.