Antiquity and The Middle Ages
Pythagoreanism
The Sophists
Eleacticism
Atomism
Platonism
Aristotelianism
Stoicism
Epicureanism
Skeptism
Scholasticism

Modern Period
Cartesianism
Empiricism
Rationalism
Materialism
Kantianism
Idealism
Hegelianism
Utilitarianism
Positivism and Logical Empiricism
Marxism
Realism
Pragmatism
Phenomenology
Existentialism