OpenMoji - An open source icon library
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OpenMoji is a great initiative and open source project from students and professors of the HfG Schwäbisch Gmünd in Germany, that offers—as the name implies—open source emojis (I would rather call these icons, what gives…) for free use in your projects.
It's a very comprehensive collection with more than 3900 emojis, available in color or outlined, plus including areas of special interest, which can be very helpful.
The emoji style itself has to really fit your project, but I'm sure it can be super helpful for many.
Visit the website of OpenMoji.