Cool application for novice developers and for those who want to save time on creating buttons for their games.
In this editor, you can create a sprite of a cool button for each of its four main states in a couple of clicks.
Sprites are downloaded in PNG format (with or without text of your choice).
P.S. You can even create buttons in the style of Minecraft and Terraria
Link:
Relevant links:
Full Feature:
Possibly slightly reduced functionality: