Pakunok has a set of prepackaged assets that you can easily include into your Rails 3.1 application (using assets pipeline).

LTI mountable engine

LTI mountable engine

This software implements a Rails 3 Middleware and an EventMachine reactor to store into a database the results of HTTP request processing

Processors for paperclip

Paperclip Waveform is a Paperclip post-processor that creates a png file with the waveform of the audio attachment .

Rails 3 generators of parse_resource

Devise is awesome, but we don't need all that UI/UX for PassKeys. This gem is to make it easy to provide a back end that authenticates a mobile front end with PassKeys.

Pattern generator provides you with convenient commands to generate patterns in your Rails app.

pay_fu engine

A rails engine to integrate Paymill subscriptions within your Rails 4.1.6 application, out of the box

Provides processors for both Carrierwave and Paperclip to allow having a version of a PDF attachment that is actually an image representing the first page on that PDF. This gem uses GhostScript, so it must be installed in order for it to work.

The Pengin is PowerDNS API mountable engine for Rails.

Peastash allows you to instrument your code with the ELK stack easily.

Sparklines are small but intense charts.

Use Percona (pt-online-schema-change) for migrations generated with this tool, all activerecord helpers are available.

An engine that provides authorization for Rails 3 apps.

A completely transparent audit logging component for your application using a stored procedure and triggers. Comes with specs for your project and a rake task to generate the reverse SQL to undo changes logged.

Create, restore, download and upload postgres dumps locally and on remote servers using capistrano. Really!

Rails plugin for postgres