- The Philosophy of Spinoza
- The Mechanism of the Human Voice
- The Physical Life of Woman:
- The Three Brides
- A Treatise Concerning the Principles of Human Knowledge
- Rollo's Philosophy. [Air]
- Thus Spake Zarathustra
- The Memorable Thoughts of Socrates
- Dialogues Concerning Natural Religion
- A Lie Never Justifiable
- A Treatise of Human Nature
- Notes from the Underground
- The Philosophy of the Conditioned
- A Philosophical Dictionary, Volume 1
- A Essay Towards a New Theory of Vision
- Laws
- Poetics. English
- Ethics — Part 1
- The Philosophy of Evolution
- How to Marry Well
- The Consolation of Philosophy
- Another Study of Woman
- Beyond Good and Evil
- Apology
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1753-54
- Essays
- The Unseen World and Other Essays
- The Philosophy of the Moral Feelings
- The Metaphysical Elements of Ethics
- A Young Hero
- Ancient and Modern Celebrated Freethinkers
- Crito
- Siouan Sociology
- Probabilities : An aid to Faith
- Probabilities : An aid to Faith
- Our Fathers Have Told Us
- Ethics — Part 2
- Improvement of the Understanding
- Philebus
- Protagoras
- The Critique of Pure Reason
- Categoriae. English
- A Philosophical Dictionary, Volume 4
- The Ethics of Drink and Other Social Questions
- Myths and myth-makers
- Seekers after God
- The Soul of Man under Socialism
- The Golden Sayings of Epictetus
- Critias
- The Ethics of Aristotle
- Feuerbach: The roots of the socialist philosophy
- Ethica. English
- The Map of Life
- Homer and Classical Philology
- Lessons in Life, for All Who Will Read Them
- Ethics — Part 5
- Fundamental Principles of the Metaphysic of Morals
- A Philosophical Dictionary, Volume 10
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- A Selection from the Discourses of Epictetus with the Encheiridion
- The Destiny of Man
- Modern Women and What is Said of Them
- Statesman
- The Dark House
- Sophist
- Letters to His Son on the Art of Becoming a Man of the World and a Gentleman, 1751
- Ethics — Part 4
- The Physiology of Marriage, Part 2
- Quotes and Images From The Confessions of J. J. Rousseau
- The Selections from the Principles of Philosophy
- The Existence of God
- Timaeus
- Secret Societies
- An Enquiry Concerning Human Understanding
- Essays
- The Child at Home
- Practical Essays
- Utilitarianism
- The Young Woman's Guide
- Civil Disobedience
- Ethics — Part 3
- The Ego and His Own
- Cratylus
- The Friendships of Women
- Thoughts out of Season Part I
- Book of Wise Sayings
- Apology, Crito, and Phaedo of Socrates
- The Prince
- Essays of Schopenhauer
- Old-Fashioned Ethics and Common-Sense Metaphysics
- Plato and Platonism
- The Ruins, or, Meditation on the Revolutions of Empires and the Law of Nature
- Chinese Literature
- The Republic
- Study of a Woman
- Politics: A Treatise on Government
- The Critique of Practical Reason
- The System of Nature, Volume 2
- Auguste Comte and Positivism
- L'homme Qui Rit