Simple NSView or NSViewController based picker for Emoji.
I took the wonderful work of AGEmojiKeyboard (https://github.com/ayushgoel/iOS-emoji-keyboard) as a base to create an OS X version.
Its extremely simple and worth a couple hours of work. Its useful if you want to allow a user to enter Emoji without having to use the "special keyboard" in the edit menu.
An example would be like Messages/iChat which has a smiley face picker next to the text entry.