Avataaars is a free Sketch Library that allows you to quickly create avatar illustrations. Combine clothes, hair, emotions, accessories, and colors.
Genies is an app that creates personalizable look-alike and expressive emojis that react to relevant daily happenings in real-time - ranging from breaking news (politics, sports, pop culture) to cultural holidays.
Pictogrify is a open source library that allows you to generate a unique pictogram from a given text. It is an alternative to identicons, used in Github, Stack Overflow, and other forums, however this is a more friendly, fun and fully extendable version! You can design and implement your own pack, enjoy!