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Screenstream(www.nchsoftware.com/screen/). Free for anyone to use, Screenstream allows Windows PC presenters to share their desktop with participants on PCs, Macs or Linux, who view the desktop through a browser with no install required.

While focused more on desktop support situations, TeamViewer allows presenters to share PC or Mac desktops with participants on PCs or Macs. Both presenters and viewers must download and install an application-making it more appropriate for internal teams than more public situations. A free version of the tool is available for private use; otherwise it starts at about $250 for six months.

Yugma provides desktop sharing, chat and white-boarding. It also supports VOIP conferencing, including a feature that integrates seminars with Skype calls. Presenters can use PC, Macs or Linux. Participants can use almost any system or browser by downloading a Java applet. A free, limited-functionality version allows up to 10 people to participate; more feature-rich versions start at about $200 per year for up to 20 people

From Nicole-A great Free app that let's you remotely access your desktop from iPad, meaning you can get to any document or application on your computer.

Free, but data becomes public

DimDim is a fairly new, streamlined online seminar application with support for chat, slide sharing, emoticons, white-boarding, VOIP voice conferencing and video conferencing. Only PC desktops can be shared, but DimDim supports Mac and Linux users for other features. Participants can enter meeting rooms using almost any system or browser, typically without a download. A free, ad-supported version allows up to 20 people to participate; a version without ads starts at $99 per year for up to 20 people.

Tableau is desktop-based data visualization software used by many large companies and media properties to create sophisticated visual representations of large datasets. They have now released Tableau Public, a free web-based tool that allows users to create and share interactive charts. The catch is that there is no ability to create private visualizations - all data that you upload to the Tableau Public site is publicly accessible to anyone on the web, and anyone can download the workbook (and underlying data) that you are displaying. The site has active forums, and is full of helpful information for people trying to get a handle on data visualization best practices.