Unity Generic Object Pool. Allows `Pool.Get</SomeMonoBehaviour/>`. Useful for avoiding `GetComponent` in a pool.

Pool.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Pool : MonoBehaviour {
    public List<PooledObject> objectsToPool;

    private Dictionary<Type, Queue<PooledObject>> dict;

    private void Awake() {
        dict = new Dictionary<Type, Queue<PooledObject>>();
        foreach (PooledObject obj in objectsToPool) {
            Queue<PooledObject> queue = new Queue<PooledObject>();
            for (int i = 0; i < 20; i++) {
                var clone = Instantiate(obj, transform);
                clone.Finished += ReQueue;
                clone.gameObject.SetActive(false);
                queue.Enqueue(clone);
            }

            dict.Add(obj.TypeOf(), queue);
        }
    }

    public T Get<T>() where T : class {
        var queue = dict[typeof(T)];
        return queue.Dequeue().behaviourToPool as T;
    }

    public PooledObject GetPooledObject<T>() {
        var queue = dict[typeof(T)];
        return queue.Dequeue();
    }

    public Queue<PooledObject> GetQueue<T>() {
        return dict[typeof(T)];
    }

    private void ReQueue(PooledObject obj) {
        obj.gameObject.SetActive(false);
        var queue = dict[obj.TypeOf()];
        queue.Enqueue(obj);
    }
}

PooledObject.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PooledObject : MonoBehaviour {
    public MonoBehaviour behaviourToPool;

    public Action<PooledObject> Finished;

    public Type TypeOf() {
        return behaviourToPool.GetType();
    }

    public void Finish() {
        if (Finished != null) {
            Finished(this);
        }
    }
}