Free resources

• Dimdim: open-source web conferencing application; free basic service
• Jott: voice-to-text service for creating notes, lists, e-mails and text messages; free basic service
• Oovoo: video messaging, chatting and conferencing
• Paltalk: group IM, chat and video call application
• Plugoo: direct chatting with any blog or site visitor
• YouSendIt: send files up to 2GB; free basic service

Source: Entrepreneur Magazine