UserEngage (https://userengage.com) - Keep things simple with a single platform for all your messaging and relationships with customers.

This gem is a Ruby Wrapper made to use the Userfox API conveniently

Make long integer ids pretty, short and less confusing by shortening via conversion to base34

Support user full name

A Ruby wrapper of User Local API

Client library for the User Management App API

This gem uses two lists (descriptive words and nouns) and multiplies them with each and another resulting in a list of mostly meaningful and often silly name combinations.

validates that username is not included in reserved list.

A rails gem providing naming methods for user models

This gem adds notifications to your app, you can display the notifications where you want, add a dropdown on your header for example. Add views, mailer views and go !

Add preferences to any Rails model easily by adding a text column and adding a couple macros

Basic private messaging system between users on a site

Stores and Accesses User Settings

UserShell is a tiny gem that uses the canonical approach to detect the shell for the current user, or a specified user.

Integrate the Usersnap-widget with Rails

Simple wrapper for the Userstack API https://userstack.com

User Stream Receiver.

Dynamic user stylesheets

Userswitch is a Rails plugin for switching between commonly used roles and users. It's particularly useful for development and staging environments when you often need to switch between various accounts. It saves you from the hassle of logging in or out.

Not a markup language - rather, an library for processing user-contributed text that handles the common ways in which ordinary users add meaning, structure and formatting using plain text.