Existentialism
Glissant
Hegel
Hobbes
Gauthier
Kant
Kant is one of the most popular philosophical frameworks ran in LD debate. It is a deontological theory, meaning it is not concerned with the consequences of moral actions but the intrinsic nature of the action itself.
For an introduction to Kantian ethics, you can try the first Velleman reading.
Readings
Velleman-An Introduction to Kantian Ethics - Highlighting.pdf
Allen W. Wood - Kantian Ethics (2007).pdf
Engstrom - Universal Legislation as a Form of Practical Knowledge.pdf
Ferrero Constitutivism and the Inescapability of Agency .pdf
Julia-Markovits-Moral-Reason-Oxford-University-Press-2014.pdf
Kant on Education (über Pädagogik) - Online Library of Liberty.pdf
Korsgaard - Origin of the Good and Animal Nature.pdf
Korsgaard - Sources of Normativity Lectures.pdf
Perpetual Peace, by Immanuel Kant—A Project Gutenberg eBook.pdf
Ripstein Kant on Law and Justice .pdf