Starting on a wiki page for this, since it’s being bundled (temporarily with machines sold during the 2019 Black Friday Sale: https://carbide3d.com/blog/2019/black-friday-2019/ ):
this is a commercial 3D CAD app.
The company has a forum: https://www.alibreforum.com/forum/index.php
It is being featured in a series of magazine articles: https://www.model-engineer.co.uk/forums/postings.asp?th=138715&p=37 — those in particular are interesting — went ahead and bought issue #274 — may have to see about getting all the digital back issues since then.
An exercise manual/tutorial is available: https://www.alibre.com/AlibreDownloads/Alibre_Atom3D_Exercise_Manual.pdf
Anyone found anything else?