dnif is a gem to index data using ActiveRecord finders, letting you index your custom methods and not only your table fields

Docent is a mountable Rails engine to provide your app's users with links to proper support documentation.

A Rails plug-in, which checks various services (db, cache, sidekiq, redis, stripe, mailgun, etc.).

Document Number lets you automacally assign number sequences for your rails model

Filters to detect spam, trolls and unwanted content

Doorkeeper Couchbase ORMs

Doorkeeper RethinkDB ORMs

Leveraging Doorkeeper as single-sign-on OAuth server. To provide true single-sign-OUT, every request on an OAuth client app is verified with the SSO server.

Provides SSO auth functionality based on Omniauth

DoorMat is a Rails Engine that provides a solution for both user authentication and the encryption of user information. It aims to offer safe defaults so you can get going with what your website is really about.

postgresql extended operators

A double-entry accural accounting system

Tools to build your double entry financial ledger

A gem for users.

Export to PDF plugin for the Dradis Framework

All draft data is saved in a separate table, so no need to worry about existing code / SQL accidentally finding non-approved data. Supports draft changes to existing objects, and creating new objects as drafts. Supports 'draft transactions' which may update / create many objects,...

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Dragonfly data store that uses Moped::GridFS.

Manipulate a database using Amazon Alexa skill voice commands, eventually to be used to create syllogisms

Droom is nice and clean.