Primary sources, open to every school.
Stoicism · Module 1
3 readings · Epictetus and Cicero
The Stoics sorted everything into what is up to us and what is not, and put almost everything people worry about in the second pile. What is left is your own judgement, and they thought that was enough.
Utilitarianism · Module 1
3 readings · Jeremy Bentham and John Stuart Mill
Utilitarians judge every act, rule and system by one test: does it leave the world with more happiness and less suffering than the alternatives? Everyone affected counts, and each counts once.
Virtue Ethics · Module 1
3 readings · Aristotle and G. E. M. Anscombe
Aristotle thought you become good the way you become a builder, by doing the work until it is part of you. What the work produces is practical wisdom, and nobody can exercise it on your behalf.