Jsdebug extends the asset pipeline for javascript logging.

Jsonapi for Rails empowers your JSON API compliant APIs. Requires very little coding. http://jsonapi.org/format/

This gem allows you to filter and sort an ActiveRecord relation based on a request, following the JSON:API specification as closely as possible.

Use Jsonify for Rails View templates

JSON schema validation for Rails

A HTML5 client-side solution for generating PDFs.

Generate a ES6 module that contains Rails routes.

Color search for Rails

Make Kalendae available in the Rails asset pipeline.

An easy way to use LINE Front-end Framework(LIFF) on rails.

Simple Kaminari pagination in Cells.

kaminari-mongo_mapper lets your MongoMapper models be paginatable

Koi CMS admin framework

Katapult is a framework for generating base code for Rails applications in two leaps. Basics Generation prepares a new Rails application with lots of best practices, Model Transformation generates application code from a model of the application.

Rails UI plugin for Killbill administration.

Kazan creates rails project and setups predefined gems and tools.

Keycloak ruby client

Shareable tools/components for building a digital collections app in Rails.

Knowledge Base is a bunch of models for Ruby on Rails that you probably need to build your own

Koalagator is an open source community calendaring platform