ProCon.org: Pros and Cons of Controversial Issues
ProCon.org is an independent, nonpartisan, 501(c)(3) nonprofit public charity with no government affiliations. Their purpose is "to provide resources for critical thinking and to educate without bias."
Topics addressed on this site range from standardizing testing, abortion, and euthanasia to medical marijuana, climate change, the death penalty, and the drinking age, plus many more.
For each topic, the presents a clear explanation of the core question, facts and statistics, and a variety of pro and con arguments. Some topics also include supporting resources as relevant, such as historical timelines or video galleries.