I was interested in philosophy for quite a while because i) I thought utilitarianism was interesting but also ii) I wanted to see what other schools of thought were out there. For a while I was kind of confused since the other schools I heard about at first (e.g. Kantianism and virtue ethics) seemed to be really vague and I wasn't sure I saw anyone who actually believed them. [I still think that's largely true.]

But over time, I've read some things that I felt helped me understand various nonutilitarian perspectives more and generally enriched my understanding of philosophy. Here are a few I liked (organized a bit by theme).  I don't claim to be super well-read; these are just some I learned from. A bunch are encyclopedia articles, some papers, some books.

It would be cool if others could share non-utilitarian writings they like!

Substantive Ethics

• Zamir and Medina, Law, Economics, and Morality [Good exposition of deontology]
• Campbell Brown, "Consequentialize This"
• https://plato.stanford.edu/entries/theory-bioethics/
  • Beauchamp and Childress, "Principles of Biomedical Ethics" (know only second-hand)
• John E. Roemer, Theories of Distributive Justice 
• Barbara Herman, The Practice of Moral Judgement (Kantianism)
• Rosalind Hursthouse, On Virtue Ethics
• Nozick, "Anarchy, State, and Utopia"
• G.A. Cohen, Self-Ownership, Freedom, and Equality
• G.A. Cohen, Rescuing Conservatism: A Defense of Existing Value
• Desert
• Special Obligations, esp. section on professional obligations
• Political Obligation
• Just War Theory IEP 
• Legal Interpretation
• Discrimination

Methodology of Ethics

• Moral Particularism and Generalism
• Alan Thomas "Should Generalism be our Regulative Ideal?"
• Meaning Holism
• Horgan and Timmons "What Does the Frame Problem Tell us About Moral Normativity?"
• Anscombe,"On Brute Facts"
• Thick Ethical Concepts
• Chapelle ed., Intuition, Theory, and Anti-Theory in Ethics
• Rawls' Sequence of Theories and Reflective Equilibrium
• Coherentism
• Bayesian Epistemology
• Sprenger and Hartmann, Bayesian Philosophy of Science (actually haven't read yet but seems very relevant to ideas like "reflective equilibrium").