qakcn

This plugin replaces build-in Gravatar with Tietuku Avatar Service. And replace Google fonts and scripts with USTC mirror. All for Chinese users.
这个插件用贴图库头像服务替代了WordPress内置的Gravatar，并且用中国电子科技大学的镜像替代Google字体和脚本。中国用户都懂的。

Tietuku Avatar for WordPress

Use Tietuku Avatar service to replace Gravatar. And replace Google fonts and scripts. 用贴图库头像服务替代Gravatar。并且替换Google字体和脚本。

mindutopia

Nate Reist

This plugin allows you to:
<ul>
<li>Add a photo with each user, much like featured images</li>
<li>Replaces the user gravatar with their featured photo</li>
<li>Only users levels that can upload_files in their capabilities can manage their user photo</li>
</ul>

Mindutopia User Thumbnails

This plugin gives you the ability to add user thumbnails to your WordPress users much like featured images on posts, the images replace the gravatars.

Tietuku Avatar for WordPress vs Mindutopia User Thumbnails