Gabcast.com is a podcasting and audioblogging platform that offers an easy way to create and distribute audio content. Most people will use a touch-tone telephone to make their recordings but we also provide worldwide access to the service through VoIP. Once you have made a recording and have published it, a newsfeed is immediately and automatically updated to alert subscribers to your channel.
Screencast.com is an easy and affordable media hosting solution for business and academic professionals who want to share multimedia content on the Web.
Gong is a free system for voice communication on the Web. It allows groups of people such as students and teachers to participate in discussion groups using their computers, using both synchronous (real-time) and asynchronous chat. It is commonly used by schools and universities for providing a 'voice board' for teaching purposes.
There are several different ways you can use Gong. All are free and unlimited