I have been an admirer of Librivox for some time. It is an informal group of readers, mostly amateur, who read out of copyright works and release them for free (by public domain). Perhaps the only down side for selective ears is the bias toward American accents but one can be selective. One reader is particularly relevant to philosophy – D. E. Wittkower is a good reader of philosophical books: some completed jointly and some as a solo reading project.

His solo reading includes: Epictetus – The Enchiridion, Hegel – Introduction to The Philosophy of History – James, The Moral Equivalent of War – Kant, Of the Injustice of Counterfeiting Books and On the Popular Judgment and Perpetual Peace – Locke, A Letter Concerning Toleration – Mill, Utilitarianism – Nietzsche (surprise surprise!) The Antichrist and Twilight – Schopenhauer, Studies in Pessimism not to mention several joint works.

AC1

PS Full disclosure: I have recently become a participant in the project.