Software to make illustrative videos explaining a research topic What are some good (preferably open-source) software for making illustrative videos to explain one's research? I am currently looking for software to make a small video on my research topic that could complement presentation slides. The video may not delve into all technical details, but should summarise all technical content in a compact and entertaining way. 

One source that I know of is Videoscribe (sample video), but I have not tried it yet. Are there other/better alternatives, especially open-source?
Not free or open-source, but my institution offers licenses to Camtasia Studio, which seems to be the best package out there for slidecasts/screencasts.

Educreations is a a comparatively much simpler - and cheaper - tool that allows you to create videos but doesn't play as well with slides.