Writing with index cards, a time-honoured way to plot your book or novel.
Drawing thoughts on index cards :: Sacha Chua
BDN Archive - How I Use Index Cards to Outline, Pt 1
Writing Tools – In Praise of the Humble Index Card – Trixieland
The Incredible Creative Power of the Index Card, by Ryan Holiday
This simple screenwriting trick can transform your speechwriting
How to Outline a Novel: 60 Index Cards Method – MARGARET DILLOWAY
Stacking Index Cards » Scrite
How to outline for a book you intend to write - Quora
Useful Writing Tools
Writing With Index Cards: The Easiest Way to Plot
The Index Card Vortex — Mountain of Ink
Stress Relief for Writers
2021 Zero Draft Thirty March Challenge: Story Prep — Index Cards!, by Scott Myers
Three Ways to Plot With Index Cards – Mythcreants