Bitmoji by Bitstrips is a mobile application that allows you to use various emoticons when writing messages, emails or any other web-based texts. Even though Bitmoji for Mac cannot be found on the developer's website, there are other tools that will let your use emoticons on Mac. Here is a list of alternatives to Bitmoji for Mac.
Feel free to add any alternative to Bitmoji for Mac that you know of.
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So, basically, I can use them within any text messenger, right?