This list in under construction while I think of a better way of categorizing these works. This is not a comprehensive list because I don't remember everything I've ever read, and I consistently forget to update this website.
Writing & Editing
Bird by Bird: Some Instructions on Writing and Life by Anne Lamott
Garner's Modern English Usage by Bryan A. Garner
The Copyeditor's Handbook: A Guide for Book Publishing and Corporate Communications, Revised, Updated, and Expanded by Amy Einsohn, Marilyn Schwartz
The Ode Less Travelled: Unlocking the Poet Within by Stephen Fry
Everybody Writes by Ann Handley
The Chicago Manual of Style 17th Edition: The Essential Guide for Writers, Editors, and Publishers by the University of Chicago Press
The Complete Handbook of Novel Writing: Everything You Need to Know to Create & Sell Your Work by the Editors of Writer's Digest
Creativity
Design Thinking: Process & Methods 5th Edition by Robert Curedale
The Alter Ego Effect by Todd Herman
Nonfiction
The Life of a Stupid Man by Ryūnosuke Akutagawa
Mythologies by Roland Barthes
The Work of Art in the Age of Mechanical Reproduction by Walter Benjamin
The Hero with a Thousand Faces by Joseph Campbell
The Hero's Journey by Joseph Campbell
Transformations of Myth Through Time by Joseph Campbell
The Masks of God by Joseph Campbell
Myths to Live By by Joseph Campbell
Creative Mythology by Joseph Campbell
Tarot Revelations by Joseph Campbell
The Wisdom of the Heart by Henry Miller
All Art is Propaganda by George Orwell
Why I Write by George Orwell
Night by Elie Wiesel
Fiction
Outer Dark by Cormac McCarthy
Blood Meridian by Cormac McCarthy
The Road by Cormac McCarthy
No Country for Old Men by Cormac McCarthy
All the Pretty Horses by Cormac McCarthy
The Stranger by Albert Camus
No Longer Human by Osamu Dazai
You Are Not a Stranger Here by Adam Haslett
The Things They Carried by Tim O'Brien
1984 by George Orwell
The Book Thief by Markus Zusak
Philosophy
Resistance, Rebellion, and Death by Albert Camus
The Fall by Albert Camus
The Rebel by Albert Camus
Myth and Reality by Mircea Eliade
The Myth of the Eternal Return by Mircea Eliade
All About Love by bell hooks
The Will to Change by bell hooks
Either/Or by Søren Kierkegaard
Fear and Trembling by Søren Kierkegaard
Repetition by Søren Kierkegaard
The Concept of Anxiety by Søren Kierkegaard
The Sickness Unto Death by Søren Kierkegaard
The First and Last Freedom by Jiddu Krishnamurti
Think on These Things by Jiddu Krishnamurti
Beyond Good and Evil by Friedrich Nietzsche
God is Dead by Friedrich Nietzsche
The Birth of Tragedy by Friedrich Nietzsche
The Gay Science by Friedrich Nietzsche
Thus Spoke Zarathustra by Friedrich Nietzsche
Politics
The Wretched of the Earth by Frantz Fanon
Manufacturing Consent: The Political Economy of the Mass Media by Edward S. Herman and Noam Chomsky
Change the World Without Taking Power: The Meaning of Revolution Today by John Holloway
The Soul of Man Under Socialism by Oscar Wilde
Psychology
The Body Keeps the Score: Brain, Mind, and Body in the Healing of Trauma by Bessel van der Kolk
Answer to Job by Carl Jung
Aspects of the Feminine by Carl Jung
Aspects of the Masculine by Carl Jung
Man and His Symbols by Carl Jung
Modern Man in Search of a Soul by Carl Jung
Mysterium Coniunctionis by Carl Jung
Psychology and Alchemy by Carl Jung
Psychology and Religion by Carl Jung
Seven Sermons to the Dead by Carl Jung
Symbols of Transformation by Carl Jung
The Archetypes and the Collective Unconscious by Carl Jung
Other
A Pattern Language: Towns, Buildings, Construction by Christopher Alexander, Sara Ishikawa, and Murray Silverstein
New Age Religion and Western Culture: Esotericism in the Mirror of Secular Thought by Wouter J. Hanegraaff