Audacity® is a free, open source software for recording and editing sounds, available for Mac OS X, Microsoft Windows, GNU/Linux, and other operating systems. It supports multiple tracks, and comes with a variety of tools necessary to clean up audio files. Users will have to supplement this tool with an application to create the necessary RSS feed, and manually publish it to a server.
Files can be exported to MP3 format with the installation of a LAME MP3 plugin. Record live audio. Convert tapes and records into digital recordings or CDs. Edit Ogg Vorbis, MP3, WAV or AIFF sound files. Cut, copy, splice or mix sounds together, and change the speed or pitch of a recording.