WP User Manager is the best solution to manage your users and create front-end profiles for your members.
Set custom avatars for users with no Gravatar. The avatar will be the first (or any other) letter of user's name on a colorful background.
WP Custom Avatar adds the capability to change the default Avatar in your website.
Simple jQuery plugin to make gmail like text avatars for profile pictures. These avatars can be scaled up to any size as they are SVG based.
Adds an author box after your post contents, with avatar and social profile links.