UnityComponentLister.cs

// Copyright 2020 - Dan Bechard
// https://github.com/dbechrd
// License: Public Domain
using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;

// Lists all classes that inherit from Component in Unity's debug log
// Note: This uses C#'s run-time type introspection (i.e. "reflection"),
// and should not be called in any performance-sensitive context.
public class UnityComponentLister : MonoBehaviour
{
    void Start()
    {
        // Queries fully qualified name of every class that inherits from UnityEngine.Component class
        List<string> componentNames = AppDomain.CurrentDomain.GetAssemblies()
            .SelectMany(t => t.GetTypes())
            .Where(t => t.IsSubclassOf(typeof(Component)))
            .Select(t => t.FullName)
            .ToList();

        // Alphabetize
        componentNames.Sort();

        // Write list to debug log
        Debug.Log(String.Join("\n", componentNames));
    }
}