Just annotations ;)

• Can be attached to any object
• Blueprints are supported
• Copy and paste are supported
• Undo/Redo are supported
• Selection tool
• Quick-open button in the user interface (to the left of each object's user interface)
• A separate object for each location on the map

Story

I actually just wanted to quickly render some text onto the map, so I quickly built an anchor for that.
Then I thought, why limit this to just my own anchor? It should work on any entity. Boom—I accidentally reinvented AttachNotes. LOL