Other Classes

    public class ModuleInfo
    {
        public string Name;
    }
    
    
    public abstract class TetherModule
    {
        public abstract void Startup();

        public abstract ModuleInfo GetInfo();
    }

ScheduleModule.cs

using System;
using Tether;

namespace Schedule
{
    public class ScheduleModule : TetherModule
    {
        public override void Startup()
        {
            Console.WriteLine("Hello World!");
        }

        public override ModuleInfo GetInfo() => 
            new ModuleInfo() { Name = "Schedule", };
    }
}

TetherStart.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Reflection;

namespace Tether
{
    public class TetherStart
    {

        string ModulesPath => @"Modules\";

        private static Dictionary<string, TetherModule> Modules = new Dictionary<string, TetherModule>();

        public TetherStart()
        {
            foreach (var file in Directory.GetFiles(ModulesPath))
            {
                if (Path.GetExtension(file) != ".dll")
                {
                    continue;
                }
                var assembly = Assembly.LoadFrom(file);
                foreach (var type in assembly.GetTypes())
                {
                    if (type.IsSubclassOf(typeof(TetherModule)))
                    {
                        var module = (TetherModule)Activator.CreateInstance(type);
                        var info = module.GetInfo();
                        if (info == null)
                        {
                            Console.WriteLine("Failed to load module `" + module.GetType().Name + "`. No info provided.");
                        }
                        else
                        {
                            Modules.Add(info.Name, module);
                        }
                    }
                }
            }

            // Modules startup after all are loaded, some modules require others to be loaded before startup
            foreach (var module in Modules)
            {
                module.Value.Startup();
            }

            Console.ReadLine();
        }

        public static TetherModule GetModule(string name) =>
            Modules.ContainsKey(name) ? Modules[name] : null;
    }
}