Department of the United Nations that promotes nuclear nonproliferation and disarmament. Provides information and links regarding nonproliferation efforts as well as descriptions of important nuclear treaties.

International organization that focuses on peaceful applications of nuclear power. Website includes information about nuclear safety/security. The IAEA Department of Safeguards is the branch particularly focused on nuclear weapon nonproliferation.

The New York Times maintains topic pages indexing current stories, commentary, and archived materials for a variety of news topics, including nuclear weapons and nuclear tests.

An easy to follow guide of "who has what" in regards to nuclear arms.

A bimonthly "snapshot" of nuclear weapons programs around the world.

An organization devoted to educating the world on nuclear weapons and paths to peace.

Website of the U.S. Department of Defense. Includes relevant information on topic.