Things just got a little better for any game developer who uses the Unity3D Engine – the formerly $400-a-piece mobile add-on packs for Android iOS are now free for life. This is a massive bonus for game devs, as it allows them to easily brings their games to the mobile scene with very little effort.
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Of course, there are limitations within these now-free add-ons that will require the Pro version of Unity ($1500) to circumvent, but this will at the very least give you a good idea of what's in store if you wish to port a game.
If you already have Unity installed, you need only update the software to access the Android and iOS build options. Sweet.