OpenToonz - OpenToonz is an animation program that is a free software version of Toonz, the animation software...
Online Convert PPTX to MP4 - Online Convert allows you to convert any Microsoft PowerPoint 2007 PPTX file to MP4 easily.
Synfig Studio - Just another WordPress site
iSpring Convert - Convert PowerPoint to HTML5 and MP4 video
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Converter365 Convert PPT to MP4 - Converter365 is an online freeware converter tool that enables you to convert PPT to MP4 with great ease.