Smashing, the spiritual successor to Dashing, is a Sinatra based framework that lets you build excellent dashboards. It looks especially great on TVs.
Written in Ruby. Has an extensive library of widgets; more can be added with SCSS, HTML, and a little Coffeescript. Has a REST API to push data to the dashboard (not pull it). Claims to have a simple DSL for accessing external data sources. Drag and drop construction. Has an extensive library of third party widgets, too.
A Mediawiki extension that allows the creation of raw HTML snippets that can be used in wiki pages that do interesting and helpful things. Implemented by creating a namespace called Widget, into which new wiki pages containing the widget code in question can be written like any other wiki page. The API is documented on this page.
A module for python that abstracts away the annoying parts of ncurses and lets you build console-based user-interfaces. Has a collection of widgets that can be assembled into larger projects. Also has graph, text editing, file browsing, subprocess initiation and monitoring, color palettes, sub-windows, and font manipulation primitives.
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