EmojiOne images provided free by EmojiOne.
Mozilla images (Firefox OS Emoji) provided free by Mozilla. Firefox OS Emoji on Github.
Twitter images (Twemoji) provided free by Twitter. Twemoji on Github.
Google images (Noto Color Emoji) provided free by Google. Google Noto project on Github.
EmojiOne (version 2.3), Mozilla (Firefox OS) and Twitter (Twemoji) images are released under the Creative Commons (CC BY 4.0) license.
Google images are released under the Apache License Version 2.0.
Unicode is a registered trademark of Unicode, Inc. in the United States and other countries. This site is not in any way associated with or endorsed or sponsored by Unicode, Inc. (aka The Unicode Consortium).
The Emоji shortnames and annotations are based on Unicode CLDR data (Version 31.0.1). Unicode CLDR 31 Release Note.
Update 11-14-2017: The Emoji shortnames and annotations of Emoji Version 5.0 (2017) are already based on Unicode CLDR data version 32.