LightMV - LightMV is the best free online service for you to make a video using photos and music.
Converter365 Convert PPT to MP4 - Converter365 is an online freeware converter tool that enables you to convert PPT to MP4 with great ease.
4K Slideshow Maker - Free app to create slideshows.
Leawo PowerPoint to Video - With Leawo PowerPoint to Video converter, you can convert PowerPoint file to video in all pop formats, like convert PowerPoint to AVI, WMV, MPEG, etc, and put PowerPoint on portable devices like iPod, iPhone, Pocket PC, PSP, etc.
Photopia - Photopia is the official successor to ProShow. Find out how you can easily transition to the next generation of slideshow software.
iSpring Convert - Convert PowerPoint to HTML5 and MP4 video