Paperclip is intended as an easy file attachment library for ActiveRecord. The intent behind it was to keep setup as easy as possible and to treat files as much like other attributes as possible. This means they aren't saved to their final locations on disk, nor are they deleted if set to nil, until ActiveRecord::Base#save is called. It manages validations based on size and presence, if required. It can transform its assigned image into thumbnails if needed, and the prerequisites are as simple as installing ImageMagick (which, for most modern Unix-based systems, is as easy as installing the right packages). Attached files are saved to the filesystem and referenced in the browser by an easily understandable specification, which has sensible and useful defaults.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

An elegant, structured (X)HTML/XML templating engine.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

RailsAdmin is a Rails engine that provides an easy-to-use interface for managing your data.

Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.

Track changes to your models, for auditing or versioning. See how a model looked at any stage in its lifecycle, revert it to any version, or restore it after it has been destroyed.

Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends.

Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends.

Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends.

Upload files in your Ruby applications, map them to a range of ORMs, store them on different backends.

Parse CSS and add vendor prefixes to CSS rules using values from the Can I Use website.

Making it easy to serialize models for client-side use

ActiveModel::Serializers allows you to generate your JSON in an object-oriented and convention-driven manner.

Do some browser detection with Ruby.

Wicked PDF uses the shell utility wkhtmltopdf to serve a PDF file to a user from HTML. In other words, rather than dealing with a PDF generation DSL of some sort, you simply write an HTML view as you would normally, and let Wicked take care of the hard stuff.

Simple authorization solution for Rails which is decoupled from user roles. All permissions are stored in a single location.