Like acts as state machine (aasm), but _way_ better (it's in Ruby too!)
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Freshheads ImageFactory module for Titanium, which currently provides access to Androids ExifInterface for image files. Also provides a memory conservative utility method to rotate an image based on Exif information and resize it, maintaining aspect ratio, in one pass.
The Ruby Spreadsheet by ywesee GmbH
xlsx generation with charts, images, automated column width, customizable styles and full schema validation. Axlsx excels at helping you generate beautiful Office Open XML Spreadsheet documents without having to understand the entire ECMA specification. Check out the README for some examples of how easy it is. Best of all, you can validate your xlsx file before serialization so you know for sure that anything generated is going to load on your client's machine.
IP geolocation web service