Sprint Excel Templates
A tried-and-true Microsoft Excel Sprint backlog template and tracking tool for agile and Scrum projects.
Official Scrum Guide (Current and Past Versions)
This is a comprehensive list of the Scrum Guide, originally published by the Scrum Alliance in 2010 and currently published by Ken Schwaber and Jeff Sutherland.
Scrum Framework Flow Diagram
This is a picture of the Scrum Framework in PNG format. Feel free to reuse it as long as you keep the copyright information in the image.