• Skype
• Gizmo
• Jajah
• Yahoo Messenger
• Freeconferencecall.com

• PrettyMay
• Evoca
• Freecorder
• Hot Recorder
• Pamela
• PowerGramo
• Total Recorder
• VoiceChum
• SoundTap 
• Call Recorder (Mac)

• Shoutcast 
• Simplecast
• SamBroadcaster 
• Oddcast 
• Winamp
• Nicecast 

• Ustream.tv
• Mogulus
• Yahoo Live
• BlogTV
• Justin.tv
• Livevideo.com
• Kyte.tv

• Audacity
• Virtual Audio Cables
• Audio Hijack (Mac)
• WiretapPro (Mac)

• Coveritlive.com

Microblogging

• Twitter
• Pownce
• Jaiku

 Presentations

• SlideShare
• VoiceThread
  
• Zoho Show 
• AjaxPresents 
• Mashable List

• Camtasia - Media Recording
• Camstudio - free screencast software 
• Jing Project - easy screencast publishing 
• SnapZPro - Media Recording
• Wink
• Screencast-o-Matic

• Yugma - Desktop Sharing
• Dimdim 
• Vyew
•  WizIQ
• Mashable List

• Meebo
• Addon Chat
• Zoho Chat
• Gabbly
• Plugoo
   

 Webcast Academy Tags of Interest