Sprig-Reap is a gem that allows you to output your application's data state to seed files.

Simple and real-life tested Rails::Engine admin interface

CarrierWave FFmpeg

Use Globalize to manage Carrierwave translated fields

Simply optimize CarrierWave images via image_optim

mimetype-fu for carrierwave

Riak Storage support for CarrierWave

Secure, encrypted file uploads using Crypt19 and CarrierWave

WebDAV support for CarrierWave

This gem integrates CKEditor 5 with CarrierWave to allow image upload.

This mountable engine has the basic functionality to manage Posts

Media Managment Library for ActiveRecord and Carrierwave

Moderated fields or whole model instances are serialized and saved into a separate moderations table. The moderation can then be accepted and the changes will be applied to the model. This way, lookups for existing, accepted fields or entries will be much faster than if using something like Paper...

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

Kuhsaft is a Rails engine that offers a simple CMS.

MTDevise Rails 5.1 engine that adds multi-tenant basecamp style user logins (multi-tenant authetication using devise) to your ruby on rails application.

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Adds support for a picture_tag and several utilities to automatically convert images to WebP

The peoplefinder provides searchable staff profiles for your organisation. Since it's a rails engine, you can re-skin it for your organisation.

Sunrise is a Open Source CMS