abyme is the modern way to handle dynamic nested forms in Rails 6+.

Allows to define special attributes for ActiveAdmin panel to make it AJAX loadable and auto-updatable

ActiveAdmin chat plugin

Provides ability to use form object in your ActiveAdmin application

An Active Admin plugin to use Selectize.js (jQuery required)

Drag and drop reordering interface for ActiveAdmin tables

Provides easy DSL integration between ActiveAdmin & state_machine

Store your currency.

Batch up your ActiveRecord "touch" operations for better performance. ActiveRecord::Base.delay_touching do ... end. When "end" is reached, all accumulated "touch" calls will be consolidated into as few database round trips as possible.

From http://edgeguides.rubyonrails.org/active_record_migrations.html#types-of-schema-dumps: There is however a trade-off: db/schema.rb cannot express database specific items such as triggers, stored procedures or check constraints. While in a migration you can execute custom SQL statements, the schema dumper cannot reconstitute those statements from the database. If you are using features like this, then you should set the schema format to :sql. No longer is this the case. You can now use the default schema format (:ruby) and still preserve your check constraints.

Automatic database view creation for ActiveRecord

This is a ruby gem that provides drop in replacement for acts_as_tree but makes use of SQL recursive statement. Be sure to have a DBMS that supports recursive queries when using this gem (e.g. PostgreSQL or SQLite).

Add relational feature to Rails (e.g. follow, block and like).

An address picker for Rails with autocompletion and map picking (adapted from https://github.com/sgruhier/jquery-addresspicker)

Loads page content into AJAX sections with AJAX links, handling the details for you, load content with javascript into designated page containers. Supports multiple and/or nested AJAX sections. Designed to be easy to use, customizable, supports browser history robustly, supports AJAX forms and has many more features. Degrades gracefully when javascript is disabled.

Almanac is the most elegant mountable blog engine that can be easily hooked up in the existing Rails application.

Instant CSV support for Rails

Bettertabs is a Rails 3.1+ engine that adds a helper and jQuery plugin to define the markup and behavior for a tabbed area in a easy and declarative way, using the appropiate JavaScript but ensuring accessibility and usability, no matter if the content is loaded statically, via ajax or just with links.

A modular CMS for Ruby on Rails 5 with an intuitive out-of-the-box interface to manage and customize components. Use Binda if you want to speed up your setup process and concentrate directly on what your application is about. Please read the documentation for more information and a quick start guide.

Gallery display for Blacklight