- A Essay Towards a New Theory of Vision
- 论语
- Ethics — Part 1
- Politics: A Treatise on Government
- Apology
- The Critique of Practical Reason
- The Memorable Thoughts of Socrates
- Summa Theologica, Part II-II (Secunda Secundae)
- A Philosophical Dictionary, Volume 1
- The Ego and His Own
- The Philosophy of Spinoza
- A Lie Never Justifiable
- Dialogues Concerning Natural Religion
- Notes from the Underground
- The Investment of Influence
- Phaedo
- The Consolation of Philosophy
- Kritik der reinen Vernunft
- Gorgias
- An Enquiry Concerning Human Understanding
- The Mechanism of the Human Voice
- Essays
- The Unseen World and Other Essays
- Meno
- The Philosophy of Evolution
- Protagoras
- Poetics. English
- On Being Human
- The Basis of Morality
- Atheism in Pagan Antiquity
- Apology, Crito, and Phaedo of Socrates
- The Prince
- Essays of Schopenhauer
- How to Observe
- How to Observe
- Plato and Platonism
- The Map of Life
- Civil Disobedience
- The Republic
- The Young Woman's Guide
- Utilitarianism
- Moral Philosophy
- Thoughts out of Season Part I
- Phaedrus
- Homer and Classical Philology
- Cratylus
- Chinese Literature
- A Man's Value to Society
- Parmenides
- Euthydemus
- The Destiny of Man
- Book of Wise Sayings
- The Physiology of Marriage, Part 2
- The Existence of God
- Auguste Comte and Positivism
- Walden
- Levels of Living
- Liberalism
- The Selections from the Principles of Philosophy
- Quotes and Images From The Confessions of J. J. Rousseau
- Critias
- A Short History of Greek Philosophy
- How To Behave: A Pocket Manual of Republican Etiquette, and Guide to Correct Personal Habits
- Beyond Good and Evil
- Sophist
- Essays
- Statesman
- A Selection from the Discourses of Epictetus with the Encheiridion
- The Ethics of Aristotle
- Democracy and Social Ethics
- Ion
- Categoriae. English
- Charmides
- Laws
- When a Man Comes to Himself
- Experiments and Considerations Touching Colours (1664)
- Myth and Science
- Fundamental Principles of the Metaphysic of Morals
- Timaeus
- Theaetetus
- The Critique of Pure Reason
- Laches
- Philebus
- The Metaphysical Elements of Ethics
- The Law and the Word
- The Philosophy of the Moral Feelings
- Ancient and Modern Celebrated Freethinkers
- Ethics — Part 2
- The Soul of Man under Socialism
- Filosofía Fundamental, Tomo I
- Varieties of Religious Experience, a Study in Human Nature
- The Heart of the New Thought
- Thus Spake Zarathustra
- Crito
- The Golden Sayings of Epictetus
- A System of Logic: Ratiocinative and Inductive
- Feuerbach: The roots of the socialist philosophy
- Seekers after God
- Lysis
- A Treatise of Human Nature