Alex Bradbury has developed Ariel, a library that uses predefined examples to work out how to extract information from other documents. It was a Google Summer of Code project and was mentioned by Austin Ziegler. More directly from Alex:

Ariel is a library that allows you to extract information from semi-structured documents (such as websites). It is different to existing tools because rather than expecting the developer to write rules to extract the desired information, Ariel will use a small number of labeled examples to generate and learn effective extraction rules. It is developed by Alex Bradbury and released under the MIT license. Read More

Scruffy is a new graphing toolkit for Ruby developed by Brasten Sager. It’s highly customizable and powerful. You can change the backgrounds, mix different types of graph together, change the graphics used for the points, change the line types, etc. You can also render to different types of output. Brasten presents some code examples at his blog. For demonstration, some is repeated below:

graph = Scruffy::Graph.new
graph.title = "Comparative Agent Performance"
graph.value_formatter = Scruffy::Formatters::Percentage.new(:precision => 0)
graph.add :stacked do |stacked|
stacked.add :bar, ‘Jack’, [30, 60, 49, 29, 100, 120]
stacked.add :bar, ‘Jill’, [120, 240, 0, 100, 140, 20]
stacked.add :bar, ‘Hill’, [10, 10, 90, 20, 40, 10]
end
graph.point_markers = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun']

graph.render(:width => 800, :as => ‘JPG’)

(Thanks to Brasten for fixing my sloppy cut and paste job. Read More