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This is a paid asset, but now you can download Smart Homing Missile Free.
Smart Homing Missile v1.0
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The Smart 2D/3D Homing Missile is a fast and easy way to implement smart missiles to your games.
Try the WebGL demo
As simple as a grab and drop, it will make your missiles smart and bring a new dimension to your gameplay. You can also create new behaviours using customizable settings right in the editor.
:: NEW Customize orientation behavior
:: Customize detection range and angle
:: Apply different guidance presets
:: Debug detection in scene view
:: OnTargetLost and OnNewTargetFound events
:: No code required