Qbrick is a Rails engine that offers a simple CMS.

Official Qiita:Team Services Integration

This gem is intended for developers that requires SMS integration to their ruby application.

Qiniu upload from

Ruby on Rails engine for running qunit javascript tests using server-side factories and user login

Qor Cache

Easily to make your own layout

This is a gem to helper you quick add qqface function to your application. This is a wrapper for the jquery.qqFace.js plugin, and add two action view helper method for use easy.

Extends String with a 'translate' method. Returned value is the according translated text for a Wordpress Post translated by QTranslate plugin.

Quadro Content Management System

Quadro Content Management System Internationalization

QuantumFields is a gem to extend your Rails model's making them able to use virtual fields from a JSON column or a Text column serialized as a Hash. This means that you can use fields that were not explicitly declared in your schema as if they were.

Class Quarter for handling with the division of a calendar year into an arbitrary grouping of quarters, by default, the US fiscal calendar.

A Ruby on Rails engine that prevents the delivery of mail.

Asynchronous mail delivery using que

An overview of the number of queries is output to the log and browser console.

A Rails engine that provides a web-based SQL query console with read-only enforcement, authorization hooks, and audit logging.

Server for the radar query interface

Query methods extend in rails 4: Asscociation has_many, union, or, like, operators...

QueryWise is a lightweight, developer-friendly tool that helps Ruby on Rails teams detect, analyze, and fix inefficient database queries. Automatically detect N+1 queries, slow queries, and missing indexes without needing heavy, expensive Application Performance Monitoring (APM) software.