Web Conferencing
Web conferencing is used to conduct live meetings, training, or presentations via the Internet. In a web conference, each participant sits at his or her own computer and is connected to other participants via the internet. This can be either a downloaded application on each of the attendees' computers or a web-based application where the attendees access the meeting by clicking on a link distributed by e-mail (meeting invitation) to enter the conference.
Skype
  Skype is software that enables individuals and businesses to make free video and voice calls, send instant messages and share files with other Skype users. Everyday, people also use Skype to make low-cost calls to landlines and mobiles. Skype is responsible for 12% of global international calling minutes, and with its users making 3.1 billion minutes of calls to landlines and mobiles in the third quarter of 2009, Skype is a leading global internet communications company. And of course, Skype-to-Skype voice and video calls are completely free. In the fourth quarter of 2009, Skype users made 36.1 billion minutes of Skype-to-Skype calls, and over a third of these were video calls.
dimdim
  Dimdim lets anyone host and attend online meetings,demos and webinars using just a web browser. Save money, time and travel by instantly sharing documents, web pages, whiteboards, audio, video - even record your events - with no software to install. Dimdim is free for small meetings and starts at only $25 per month for unlimited use with more participants.
Adobe ConnectNow
  Adobe ConnectNow, one of the Acrobat.com services, is a great way to share ideas, discuss details, and complete work with others - all online. Reduce travel costs, save time, and increase productivity with a web conferencing solution that's easy to access and simple to use. Built on the Adobe Flash Platform, ConnectNow operates inside a web browser. There's no installation required, so getting started is easy - and free
Go to My PC
  GoToMyPC is the fast, easy and secure way to access your Mac or PC from any Web browser in real time. Access files, programs, email, and network. Increase your flexibility and productivity. Work on your office computer from home. Travel and use your Mac or PC remotely. Take your office with you wherever you go.