PlaceImg lets you easily add placeholder images to your HTML by generating images with RMagick and serving them as data URLs via an easy to use helper method.

Rank images on an HTML page for use as a thumbnail

A little Sinatra and RMagick to generate placeholder images via an http call. Heavily inspired by http://placehold.it

Poodle is a started kit for creating Rails Application. Poodle comes with built in UI (layout, css/JS) and some helpers which boost the creation of any prototype application

Generate pretty QR code

A TTF font rendering plugin for rails using RMagick.

Prizm uses rmagick to extract colors from images

Use this gem if, like me, you're bad at Photoshop and want to ceate wallpapers like those on "The Profound Programmer"

Take a psd with layers, one for each frame, and output to a single png file with each frame placed next to the other in order of the layers in the psd.

This gem is made up off two libraries. A cutter library - determines all the points to cut. Rmagick rapper, which actually cuts up the images.

Create beautify code snippet image.

二维码批量生成工具，支持内嵌Logo

Quadtone Toolkit (QTTK): Tools for working with the quadtone printing process.

This is a gem to help you to structure common reports of you application just by writing in the controller

A file upload library for use with MongoDB and S3

Generate a beautiful wallpaper from a specified quote

A rack middleware to show gray-scaled favicon on development

Generate favicons for IE, FF, Chrome, Safari!

Under development. Contributors welcome.

It's a Rails Captcha Engine for Rails 3 applications.