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From Aspose:
Aspose.Slides is a .NET component to read, write and modify a PowerPoint document without using MS PowerPoint. PowerPoint versions from 97-2007 and all three PowerPoint formats: PPT, POT, PPS are also supported. Now you can create, access, copy, clone, edit and delete slides in your presentations. Other features include saving PowerPoint slides into PDF, adding and modifying audio and video frames, using shapes like rectangles or ellipses and saving presentations in SVG format, streams or images.
Well, i don't agree with above review. Aspose.Slides does more than what it offers. As a proof, you can check it's online wiki. Aspose.Slides wiki discusses most of the features offered by Aspose.Slides. Moreover, all topics include Code Snippets and Screenshots that can give us a better idea about what Aspose.Slides is capable of. Personally, i don't find any PowerPoint component that solid and mature than Aspose.Slides.
Moreover, a detailed Product Overview and Features List can also be reviewed by everyone on Aspose.Slides Wiki. Just give it a try and you will find the truth by yourself.