A reference management package for scene assets in Unity
Follow the steps Here to add this package to your Unity project using this package's URL.
If you're using empty objects with descriptive names to organize your scene, then you may find use with Scene Layouts. Use Create -> Scene Object -> Scene Layout to create a neat scriptable object that has a list of strings and a wrapper string. When using the Scene Creator menu, you can assign a layout object during creation. Doing so will automatically create an empty object for each item in the list with a name surrounded by the wrapper. By default, any item you add to the list will create an object in the format ===== Object Name =====.
Use Scene Creator in the right-click menu of the project panel to get a window. The Location is automatically populated with the path that you right-clicked to open the menu. You can freely select any folder and use Set to Active to automatically populate the path. Next, Scene Name is where you will name the scene. This name is used for the scene asset, the scene object, and the folder that they will reside in. If you have a layout defined, you can select it and even modify it in the Layout box. After everything is created, click Create. The new directory should be created with 2 files within, a scene asset and a scene object.
The included implementation of ISceneLoader (called Instant Loader) will likely handle most situations. It unloads the current scene, then loads the next scene. You can choose to show a loading screen as it does this. If you do use a loading screen, the loader will automatically search for a LoadingBarBehaviour component in the scene and push progress updates to it. The LoadingBarBehaviour has 1 field where you can drop in an IDisplayProgress object. I've included an implementation called SliderProgressDisplay which will show the progress on a Slider component from Unity. To get this to work, create a Slider in the loading scene and attach both a SliderProgressDisplay component and a LoadingBarBehaviour component to it, then drag the SliderProgressDisplay component into the Progress Display field of LoadingBarBehaviour. Now, whenever this loading scene is used, the slider will automatically keep track of progress. This may seem like a lot of steps to get this to work, however it is intended for those that want to use something other than Unity's Slider. You can quickly implement your own IDisplayProgress for whatever component you create and the system can still latch on automatically.
Metadata is useful if you want to add some additional information about your scenes to be used elsewhere in code. I did include SimpleMetadata as an example, however I would highly recommend against using it as you cannot change it and in order to fully utilize it, you would need to reference the Implementations portion of the code, which is not the intent of the system. Instead, you should create a new class that implements ISceneMetadata where you can add any amount of information you please. This interface does not require any methods or properties, however the implementing object should be a class. After creating the class, it should pop up in the Scene Object's Metadata dropdown.