Designer friendly modular components that can be mixed and matched in an almost "Visual Logic" way thanks to UnityEvent and Zenject. LICENSE: MIT

AudioManagerExtensions.cs

using UnityEngine;

public static class AudioManagerExtensions {

	public static void PlayClip(this IAudioManager audioManager, AudioClip clip) {
		audioManager.PlayClip(clip, 1f);
	}

}

Damager.cs

using System;
using UnityEngine;
using UnityEngine.Events;

public sealed class Damager : MonoBehaviour {
	
	#region Inspectable Properties

	[SerializeField]
	private int _damageHitpoints = 1;

	public int DamageHitpoints {
		get { return _damageHitpoints; }
		set { _damageHitpoints = value; }
	}

	#endregion

	#region Inspectable Events

	[Serializable]
	public sealed class DamagerEventHandler : UnityEvent<Damager, GameObject> { }

	[SerializeField]
	private DamagerEventHandler _damagedEvent = new DamagerEventHandler();

	public DamagerEventHandler DamagedEvent {
		get { return _damagedEvent; }
	}

	#endregion

	#region Messages and Event Handlers

	private void OnCollisionEnter(Collision collision) {
		var otherHealth = collision.gameObject.GetComponent<Health>();
		if (otherHealth != null)
			otherHealth.Hitpoints -= DamageHitpoints;

		DamagedEvent.Invoke(this, collision.gameObject);
	}

	#endregion

}

Health.cs

using System;
using UnityEngine;
using UnityEngine.Events;

public sealed class Health : MonoBehaviour {

	private int _hitpoints;

	#region Inspectable Properties

	[SerializeField]
	private int _initialHitpoints = 10;

	public int InitialHitpoints {
		get { return _initialHitpoints; }
		set { _initialHitpoints = value; }
	}

	#endregion

	#region Inspectable Events

	[Serializable]
	public sealed class HealthEventHandler : UnityEvent<Health> { }

	[SerializeField]
	private HealthEventHandler _damagedEvent = new HealthEventHandler();
	[SerializeField]
	private HealthEventHandler _destroyedEvent = new HealthEventHandler();

	public HealthEventHandler DamagedEvent {
		get { return _damagedEvent; }
	}
	public HealthEventHandler DestroyedEvent {
		get { return _destroyedEvent; }
	}

	#endregion

	#region Messages and Event Handlers

	private void Awake() {
		_hitpoints = InitialHitpoints;
	}

	#endregion

	public int Hitpoints {
		get { return _hitpoints; }
		set {
			if (value == _hitpoints)
				return;

			int oldValue = _hitpoints;
			_hitpoints = Mathf.Max(0, value);

			if (_hitpoints < oldValue) {
				DamagedEvent.Invoke(this);
				if (_hitpoints == 0)
					DestroyedEvent.Invoke(this);
			}
		}
	}

}

IAudioManager.cs

using UnityEngine;

public interface IAudioManager {

	void PlayClip(AudioClip clip, float volumeScale);

}

LICENSE

The MIT License (MIT)

Copyright (c) 2015 Lea Hayes

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

PlayAudioClip.cs

using UnityEngine;
using Zenject;

public class PlayAudioClip : MonoBehaviour {

	[Inject]
	private IAudioManager _audioManager;

	#region Inspectable Properties

	[SerializeField]
	private AudioClip _clip;
	[SerializeField]
	private float _volumeScale  = 1f;

	public AudioClip Clip {
		get { return _clip; }
		set { _clip = value; }
	}

	public float VolumeScale {
		get { return _volumeScale; }
		set { _volumeScale = value; }
	}

	#endregion

	public void Execute() {
		if (Clip != null && VolumeScale > 0f)
			_audioManager.PlayClip(Clip, VolumeScale);
	}

}

SpawnPrefab.cs

using UnityEngine;

public class SpawnPrefab : MonoBehaviour {

	#region Inspectable Properties

	[SerializeField]
	private GameObject _prefab;

	[SerializeField]
	private bool _inheritPosition;
	[SerializeField]
	private bool _inheritRotation;
	[SerializeField]
	private bool _inheritScale;

	public GameObject Prefab {
		get { return _prefab; }
		set { _prefab = value; }
	}

	public bool InheritPosition {
		get { return _inheritPosition; }
		set { _inheritPosition = value; }
	}
	public bool InheritRotation {
		get { return _inheritRotation; }
		set { _inheritRotation = value; }
	}
	public bool InheritScale {
		get { return _inheritScale; }
		set { _inheritScale = value; }
	}

	#endregion

	public void Execute() {
		// TODO: Use pooling instead :)
		var instance = (GameObject)Instantiate(_prefab);

		if (InheritPosition)
			instance.transform.position = transform.position;
		if (InheritRotation)
			instance.transform.rotation = transform.rotation;
		if (InheritScale)
			instance.transform.localScale = transform.localScale;
	}

}