280 Slides is an excellent alternative. It's web technology that enables you to create a presentation from your browser, without having to install desktop software on your computer. As everyone has access to a web browser, using 280 Slides is an easy way of creating your presentation, quickly. It ships with some basic themes to get you started and you can save your presentation as a PowerPoint presentation, if you need to access it from your desktop PC at a later date.
280 Slides link.
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