Ethics changes as history changes and, in a way, you will find an ethics in every philosophical work. Kant was of the great moralists, with his Metaphysics of Morals, for example. Aristotle's Nicomachean Ehics. Spinoza's Ethics s actually an ontology, but with deep ethical implications. Nietzsche was an ethicist through and through. But really, truly, an ethics for the day is still Marxist, for example his chapter in Capital vol 1 on the working day. As well as Engels' book on the family, and even the Communist Manifesto. They have their claims of what's right and what's wrong. For my money though, Deleuze's primer, very short Spinoza: Political Philosophy is a must read in this regard. The main shift there is to not ask "what's good or evil?" but "what is good or bad for me?" like food, some poisonous, some nourishing. And that's Nietzschean legacy too.