PodKoi - Find podcasts to be interviewed on & guests to interview.
ForumFree - ForumFree allows you to create a forum or a blog in a few simple steps.
PodBooker - The easiest way to get booked on podcasts
Proboards - ProBoards is a host of free forums with customer service.
Suggest a Guest - Easily suggest a guest for your favorite podcasts
Disciple - Grow, engage and monetise your community with Disciple community software. Get your own branded community platform on Web, iOS and Android