The online word cloud generator, Wordle has become an internet favorite for generating pictures of words. The layout algorithm for Wordle is however not shared outside of IBM.
Given Wordle's success in offering a tool for participtory visualization I've wanted to create an open implementation of a word cloud generator, with user generated and pluggable layout algorithms, additional manual tweaking of layout, and other visual display controls.
This on-going project is currently under construction. A demo version is available, but I am still working on some of the controls for manual manipulation of text and font size as well as further optimizing hit-testing and sample layout algorithms.
The platform is written in Adobe Flex and ActionScript.
If you're interested in contributing to this project, please contact me fjania [at] gmail [dot] com.