Works on any platform - this is a BETA version, so it doesn't serve ALL RSS feeds, but feel free to try it out. Just cut-and-paste this javascript in your html and you will be serving news / xml feeds from other sites. A great way to have dynamic content on an otherwise static page.
Most scripts are free or open source. But some have the full source code available for download yet itīs required to have permission to use them and most often the price will be listed. If there is a script license e.g. GNU or GPL then it will also be listed.