This tool provides an easy method for assigned a tag to as many GameObjects as you want all at once. It was written to get around needing to scroll through all of the tags in Unity just to create a new one and then scroll again in order to assign it to one GameObject at a time. Simply select your GameObject(s), search for a tag in the tool, create a new tag if the one you want doesn't exist yet, and then set it!

You also automatically get a Tag.cs file written as a static lookup for tags so you no longer have to reference tags by "magic strings". Instead just use Tag.[your tag name] in code and you have your tag's string value!