Rails Form Builder supports Client-side validation using jQuery BootstrapValidator plugin. https://github.com/nghuuphuoc/bootstrapvalidator

Produce Bootstrap html with semantic helper methods.

Bootstrap wysiwyg gem for rails

The borutus plugin provides a complete double entry accounting system for use in any Ruby on Rails application. The plugin follows general Double Entry Bookkeeping practices. All calculations are done using BigDecimal in order to prevent floating point rounding errors. The plugin requires a decimal type on your database as well. %

Rails file manager engine

An agile user story tracker that generates gherkin files and step definitions for use with the cucumber testing framework.

A breadcrumbs plugin for Ruby on Rails 4.x and 5.0.

A mountable engine for bridge data storage, can either be used for direct database connection or as a localized data storage mechanism

BrowserStack makes it really easy to test with different browsers, but this makes it even easier by adding a button to ever page and allowing you to quickly go through the browsers you need to test on.

Add Browser Sync into a rails app

BuildingBlocks goes beyond blocks and partials

MixIn used to extend ActiveRecord::Base classes implementing bulk insert and update operations through {#create_many} and {#update_many}.

Black magic for defining model-driven routes.

A gem to access the Bumeran api: https://developers.bumeran.com

Butler is a Rack Middleware that serves static assets for your Rails app. It allows you to set HTTP headers for individual files or folders based on rules.

C2 aspires to be a simple, drop in, Admin Portal + CMS for apps based on Rails 3 + Mongoid.

Provide a cache system for single ActiveRecord objects with expiry on update and delete

Imagine you have an Account model which has many transactions. calculable_attrs gem allows you to define Account#balance as SUM(transactions.amount) directly in your Account model. And solves n+1 problem for you in an elegant way.

Rails active record grouping with range

simple calendar gem, including helpers to display objects inside cells