Creative Commons has built a series of open source tools to assist end users in publishing and use of CC-licensed media. For more tools, including some developed by third parties, see Category:Tools.
CC Publisher is a tool that does two things: it will help you tag your audio and video files with information about your license and it allows you to upload Creative Commons-licensed audio and video works to the Internet Archive for free hosting. You also have the option of publishing the licensed and tagged audio works on your own site. ccPublisher is licensed under the GNU GPL.
CC Lookup is a tool to verify embedded license information. MP3 files tagged with ccPublisher carry information about what license was chosen for the file and a public URL where the license can be validated. If you've downloaded an audio file from the Internet Archive or a P2P network like Morpheus that claims to be Creative Commons licensed, this application will verify that for you. ccLookup is licensed under the GNU GPL.
We have extensions for Mozilla-based browsers (including Firefox), to enable viewing of Creative Commons licenses within your browser automatically.
http://search.creativecommons.org provides a unified interface to CC-enabled web and media-specific search engines.