Here are some of his most notable works:
* "Die Ethik" (Ethics) (1885): This is his most important work, a comprehensive and systematic treatment of ethics. In it, Hilty argues for a "practical" ethics based on the idea of "good will" and the "moral imperative."
* "Das glückliche Leben" (The Happy Life) (1905): This book explores the nature of happiness and offers practical guidance on how to achieve it.
* "Jenseits der Willensfreiheit" (Beyond Freedom of the Will) (1911): This work delves into the complexities of free will and determinism, arguing for a concept of "freedom within limits."
* "Der Kampf ums Dasein" (The Struggle for Existence) (1913): This book examines the challenges and opportunities of human existence in a changing world.
* "Die Religion im Wandel der Zeit" (Religion in the Changing Times) (1916): This work reflects on the role of religion in modern society and its evolving relationship with science and reason.
* "Das Reich der Zwecke" (The Realm of Ends) (1921): This book explores the concept of purpose and the pursuit of meaning in life.
Hilty's writings are characterized by their clarity, their focus on practical application, and their emphasis on the importance of moral responsibility. He continues to be studied and admired for his contributions to ethics and philosophy.