At The Travelin' Librarian, Michael Sauers alerts us to the fact that Windows 10 includes a built-in screencasting tool!
The link to the full original article is http://betanews.com/2015/07/19/windows-10-secret-screen-recording-tool/.
There's doesn't appear to be any after-the-fact editing available in this tool, and I haven't actually tried it myself. How about you, does it look useful?