Download the source code for mobile games and other useful game dev assets here. And the best thing is, they're all free!
Unity
Spawn System
Easily and quickly implement a round spawn system in your game. Using the round event system you can implement any action to be performed, including (but not limited to): changing lighting, spawning preparation objects, displaying text/help on screen, and playing audio.
Unity
Swipe Menu
Created intuitive 2D and 3D animated menus with full mobile and mouse support.Easily add inertia, with differentiation between swipes and flicks based on the speed of the movement.