AS3Commons based on Liscense: Mozila Public License 1.1(MPL1.1). It bring you some well know java.(langlutil).*goodies, like a collection framework, string utilities for actionscript3. It could be run on almost all the operating system. You could download it on following URL:
It might be worth noting that this project is discontinued.
We have started a new project with the same mission (and name). We might include the code of the original project.
For more info, please see http://www.as3commons.org/