You are correct in that there are a several commercial solutions. A few I know of are HTML5Point, Aspose, and iSpring. Aspose generates an HTML page with a large embedded SVG of the source presentation. HTML5Point outputs excellent HTML% supporting all PPT features and iSpring does as well. I don’t like the SVG solution and I don’t like the fact that the others use MS Office PowerPoint to process the .pptx file. This means one presentation at a time (slowly) which doesn’t meet my requirements. Not only would it be a fun project it would be one of a kind both for open source and commercial. I could land several large clients if it were in my hands today. Wish I had the time to do it. Maybe after my current project.
