The document discusses Ruby Identicon, an open source Ruby gem for generating identicon images from text. It can generate identicons at different sizes using the RMagick or GD graphics libraries. The gem is hosted on GitHub and can be installed via RubyGems. Examples are given showing how to generate identicon images from text and save them to files while optionally specifying the size. Links are provided to the GitHub source code and a website that also generates identicons.