WebEx (a Cisco enterprise) is a platform that provides on-demand collaboration, online meeting, web conferencing and video conferencing applications. But unfortunately WebEx is not a free service and comes at a price. The monthly plan costs $69 per month and the pre-paid annual subscription costs $59 per month. However here is a mash-up that you can use, if you are trying to find an alternative.
Screen Sharing Software
TeamViewer (www.teamviewer.com) is free remote access software that lets you share your computer desktop / PowerPoint screen with other participants. This software doesn’t have voice support, but you can use chat service and also it has screen marking tools that you can use.
VoIP / Conferencing
Skype (www.skype.com) is a software application that allows users to make telephone calls over the Internet. Calls to other users of the service, and in some countries to free-of-charge numbers are free, while calls to other landlines and mobile phones can be made for a fee. Additional features include instant messaging, file transfer and video conferencing.
Reservationless Standard Plan is a free telephone conferencing service from FreeConference.com can be used instantly and securely without the assistance of an operator. The company provides a US Telephone number that other can dial-in. This free service is not extended to other parts of the globe.
Sabsebolo (www.sabsebolo.com) offers free conferencing facility in India. Users have to dial a local number to get connected. The local numbers are now currently available for Mumbai, Bangalore, Delhi, Chennai, Hyderabad and Kolkata. So if the participants are from multiple locations then users may have to dial in a STD number