Windows/Mac/Linux: With pictures, videos, and high-resolution fonts, slideshows can make up some pretty big files—fine if you've got a large enough thumb drive or CD-R, but what if you have to email? Sun Presentation Manager, a free extension for OpenOffice, shrinks down files by compressing graphics, deleting hidden slides, and creating static versions of linked objects. It works similar to the PowerPoint-based PPTminimizer, but without the fee and exclusive Office platform—you can use the extension on either OpenOffice files or imported PowerPoint projects. Sun Presentation Manager is a free download, and requires OpenOffice 2.3 or StarOffice 8 or later.

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