If you have a presence validation, you'll probably want a non-null constraint to go with it.

== Ocean Ocean is an application template and an architecture for creating server-oriented architectures (SOAs) in the cloud. Ocean is a complete and extremely scalable back end solution for RESTful JSON web services and web applications, featuring aggressive caching and full HTTP client abstraction. Ocean fully implements HATEOAS principles, allowing the programming object model to move fully out onto the net, while maintaining a very high degree of decoupling. Ocean is also a development, staging and deployment pipeline featuring continuous integration and testing in a TDD and/or BDD environment. Ocean can be used for continuous deployment or for scheduled releases. Front end tests are run in parallel using a matrix of operating systems and browser types. The pipeline can very easily be extended with new development branches and quality assurance environments with automatic testing and deployment. Together, Ocean allows you to code front end clients completely independently of browser type and OS, and back end code completely agnostic of whether it is called by a client browser or another server system.

OkuribitoRails is an engine for Rails that aims to manage method call status. And you can identify uncalled methods.

OpenSeadragon is a javascript library for displaying tiling images. This gem packages those assets and some Rails helpers for using them

locale-specific attachments with paperclip and globalize

A Solar Hijri (Jalali) date library for Ruby, whitch provides much of Ruby's built-in date class

A dbadapter implementation to use sqlite3 as jobstore

Queue any method in any class or instance with no need for additional Worker class and no extra code

Generate permalink attributes on ActiveModel/ActiveRecord

Easy denormalization for your ActiveRecord models

Uniform Omni-Relational ActiveRecord Tools. Includes polymorphic and any belongs_to relation.

Intelligent caching, no observers necessary

Procore Ruby Gem

Runs regular Rails/ActiveRecord migrations via the Percona Toolkit pt-online-schema-change tool.

Pugin is a component-based pattern design library that holds all of the reusable partials, styles and scripts for elements of UK Parliament microservices.

A batteries-included monitoring tool for single hosts. Works great with Kamal.

A data scraping framework

SQL queries counter for Rails apps

This gem provides the Quill.js Rich Text Editor assets and view helper for your Rails 3.1/4.0 application.

A Rails plugin that contains helpers for Bootstrap