Today at GDC Epic has announced an Unreal Engine 4 subscription plan, To make the engine more user friendly for amateur developers and smaller indie teams. Tim Sweeney announced Epic is making the Unreal Engine 4 available to the public for the low cost of $19 a month. Epic will takes a five-percent royalty of gross revenue.
The UE4 version being made available to the public covers the PC, Mac, iOS, and Android platforms. Epic hopes to add console support over time. If you want to learn more you can check out the Epic website. Also at GDC you can Crytek announced a Subscription plan for Cryengine, you can learn more here.