PBS
Pbs American Experience: The Invasion of Grenada
A concise article on the 1983 U.S. invasion of Grenada. Also, refers to the US Marine barracks bombing in Beirut.
Other
Global Policy Forum: u.s. Invasion of Grenada
Reassessment of the invasion of Grenada by the United States in 1983. Discusses the island nation before, during, and after the invasion. Leans more progressive.
University of Groningen
American History: Outlines: Foreign Affairs
Part of a chapter on U.S. Conservatism and a New World Order discusses foreign affairs of the Reagan years and beyond.
US Navy
Grenada: Operation Urgent Fury
Excerpts from a military account of the Grenada invasion. Includes links to bibliography of books about the invasion of Grenada and a list of US Navy Ships participating in Operation Urgent Fury.
Other
Reagan's Speech on Beirut and Grenada
This site provides the text of the televised speech Reagan gave from the Oval Office on October 27th, 1983, detailing U.S. dealings in Lebanon and Grenada (the part concerning Grenada starts near the middle of the text).