Plug-ins, Players, and Viewers

Adobe Acrobat Reader
Adobe® Acrobat® Reader is free, and freely distributable, software that lets you view and print Adobe Portable Document Format (PDF) files
Microsoft PowerPoint® Viewer
This viewer allows people who use PowerPoint to share their presentations with people who do not have PowerPoint installed on their computers. When you post presentations on the Internet, you can include the PowerPoint Viewer to expand your online audience to people who might not have PowerPoint, or to those with different versions. You can view and print presentations, but you cannot edit them in the PowerPoint Viewer.
Open Office
Free and open source software that includes word processing, spreadsheet, presentation, drawing and database applications. The word processing component of Open Office, Writer, will allow you to open and edit Microsoft Word documents.
Adobe Flash
Flash Player allows you to enjoy the most expressive, engaging experiences on the Web that combine interactive, rich content with video, graphics and animation.
Adobe Shockwave
Shockwave Player displays Web content that has been created by Adobe (Macromedia) Director.
Apple Quicktime
QuickTime is software that allows Mac and Windows users to play back audio and video on their computers.