Podcasting

Elgg is an open source social networking system including customisable profiles / dashboards, blogging, RSS aggregation, podcasting facilities, full internationalisation, LDAP, flexible plugin APIs and more.

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Developer: Ben Werdmuller
License: GNU General Public License (GPL)
Operating System: All

MediaCore is an open source media focused content management system.

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Developer: Simple Station
License: GNU General Public License version 3.0 (GPLv3)
Operating System: Unix / Linux / Mac OS X

Pre Podcast Portal is highly effective script, developed in php to provide complete solution for podcasting.

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Developer: PreProjects.com
License: GNU General Public License (GPL)
Operating System: All

Podcast Generator is a free PHP script released under GPL that lets users upload media files via a web form and automatically create rss 2.

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Developer: Alberto Betella
License: Freeware
Operating System: Linux, Unix, Windows