Vlogs:
Natasha Hertanto (video comes with CC)
Apps/Websites:
Scrivener
XMind
StoryPlanner
MindManager Mind Mapping
Novlr
Trello
Hiveword
Google Docs
Books:
K. M. Weiland
Outlining Your Novel: Map Your Way to Success
Structuring Your Novel: Essential Keys for Writing an Outstanding Story
Outlining Your Novel Workbook: Step-by-Step Exercises for Planning Your Best Book
Lisa Cron: Story Genius: How to Outline Your Novel Using the Secrets of Brain Science (Before You Waste Three Years Writing 327 Pages That Go Nowhere)
Randall Ingermanson: How to Write a Novel Using the Snowflake Method
I have found many of the above resources very helpful in planning my book, and hope that this list is useful for you too!