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If you need to create a presentation based on a collection of images and you're short on time, there's no easier way to do it than with LibreOffice 4.1 Presentation software.
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The article explains how you can make a presentation using LibreOffice which is an open-source software. It is a great alternative to PowerPoint and produces a similar result for free.
The link to LibreOffice website http://www.libreoffice.org/
Free alternative to PowerPoint. (open source)