http://code.google.com/apis/visualization/documentation/gallery.html
Check out the word cloud visualization. Not as fancy as wordle.net but real easy to add to your site.
Here is yet another end-to-end implementation of wordle in Python 3 largely based on the initial outline by Jonathan Feinberg (QuadTrees, spirals, etc.).
The code (commented, with detailed ReadMe file) is freely available at this Github repository and this is a sample wordle created with the code.
I've implemented a word cloud generator called WordCloud.jl in Julia language. A brief description about its algorithm can be found here.
Unlike most other implementations, I designed it based on gradient optimization. It’s a non-greedy algorithm in which words can be further moved after they are positioned. Thus the size of the words and the shape and size of the background mask can be kept unchanged in the generation process. This makes the outputs more accurate and easy to customize. Furthermore, we can also generate some fancy outputs like these:
Comparison of Obama's and Trump's inaugural address and Wikipedia: Julia
There is a pretty nice little JavaScript library made by Tim Dream:
https://github.com/timdream/wordcloud2.js/blob/gh-pages/API.md
It can create a word cloud on a canvas or with HTML tags with a lot of options to modify the result. It comes really close to wordle's output.
