The Silverstripe CMS User Help in Markdown format, as published on userhelp.silverstripe.org (source).
CC Attribution 4.0 International
Thanks to Paul Clarke, Sacha Judd, Aaron Carlino, Scott Hutchinson, Jake Dale, Jared Lee, Rachel Margaret, Benn Crawford and Nicole Williams, James Cocker purplespider, Fred Condo, Anita Graham, Nigel Vining, Stephen Metcalfe, Marcus Dalgren, the users going by the names of Martijn, Mike, Sunnybex, Fil, Stefdv and Brian Boyko.