The American Civil War Homepage -- The American Civil War Homepage, made available by the University of Tennessee, provides timelines, descriptions of battles (state by state), letters, documents, and links.
The American Civil War Museum -- The museum seeks to be the preeminent center for the exploration of the American Civil War and its legacies from multiple perspectives: Union and Confederate, enslaved and free African Americans, soldiers and civilians.
The Center for Civil War Research -- The University of Mississippi established the Center for Civil War Research in the spring of 2009. It is designed to promote a more thorough understanding of the American Civil War, its history, and its scholarship.
Civil War Research & Commemoration -- This website is made available by the U.S. Army Center of Military History. It provides a timeline of the American Civil War, general reference material, access to artwork and photographs, archival material, and additional resources.
The Valley of the Shadow -- The Valley of the Shadow depicts two communities, one Northern and one Southern, through the experience of the American Civil War. The project focuses on Augusta County, Virginia and Franklin County, Pennsylvania, and it presents a hypermedia archive of thousands of sources that creates a social history of the coming, fighting, and aftermath of the Civil War.
Internet History Sourcebooks Project - The Internet History Sourcebooks are wonderful collections of public domain and copy-permitted historical texts for educational use by Paul Halsall. The site and its documents are well organized and the breadth of materials is impressive. Includes U.S. Civil War, and U.S. Immigration.