Gravatar is described as 'An "avatar" is an image that represents you online—a little picture that appears next to your name when you interact with websites' and is a popular website in the social & communications category. There are more than 10 alternatives to Gravatar, not only websites but also apps for a variety of platforms, including Self-Hosted, Android, Android Tablet and Mac apps. The best Gravatar alternative is Libravatar, which is both free and Open Source. Other great sites and apps similar to Gravatar are Personas Avatar Generator, DiceBear, Adorable Avatars and KnowEm.
Libravatar is a service which delivers your avatar to other websites. It is a federated open-source service. A simple API for developers.
Pixel-Art Avatar Generator and -Provider by Identifier/Hash/Seed in JavaScript for Browsers and NodeJS with HTTP-API
Gravatar distributes a user uploaded image, DiceBear generates an avatar
Adorable Avatars is an avatar placeholder service for web developers and designers.
Search over 550 popular social networks, over 150 domain names, and the entire USPTO Trademark Database to instantly secure your brand on the internet.
It's a completely different thing which has nothing to do with avatars.
KnowEm does not serve the same purpose of Gravatar
Avatarly is a simple gem for creating gmail-like user avatars based on user email or any other string passed.
Robohash is a easy web service that makes it easy to provide unique robot/alien/monster/whatever images for any text. Put in any text (such as IP address, email, filename, userid or whatever else you like) and get back a pretty image for your site.
gravatar distributes a user uploaded image, Robohash generates an avatar
sexy ui gradients as avatars
This is a port of ChameleonOS' contact identicons feature with some additional features and fixes. When enabled, new contacts will be assigned a unique identicon instead of the default picture.
Replace your missing contact photos with stylish identicons that uniquely identify all of your friends.
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It does the same things, but it has a better user interface (more user friendly) and it's open source