1) Dimdim

'Dimdim' is a free web-based conferencing service. Here you can start the meeting and invite others via e-mail, directly from the browser. Apart from offering collaboration tools such as whiteboard, chat (text/audio/video), ‘dimdim’ has some additional unique features.

An advantage of ‘dimdim’ is the desktop sharing facility by the presenter to share her desktop with the attendees.

Once the presenter shares her desktop (using the ‘Screen’ option), the desktop screen will immediately be visible to all the participants. This could be useful in product demonstration and co-browsing.

Another feature of ‘dimdim’ is the facility to make live presentations with PowerPoint and PDF files.

2) Twiddla

To start an online meeting with a couple of mouse clicks, try out Twiddla. To initiate a meeting, go through the one-time registration process and click on the ‘Start meeting’ button.

You can make the meeting public or password-protected invite-only. When you initiate a meeting, you get a meeting URL for sharing with potential attendees. The service offers facilities for co-browsing, text/audio chatting and the like.

While browsing with others you can insert comments, and place coloured marks on the page being viewed. In addition, it provides a whiteboard that enables the participants to collaboratively write, and draw pictures.

3) Palbee

It allows you to conduct unlimited videoconference (with five people) sessions.

To enliven the video session, the service lets you run slideshows along with a whiteboard.

A great advantage of this service is the facility to record the sessions for sharing them with others later.