U-boat Archive preserves documents and photographs from the World War II submarine war and was still adding German patrol records in 2026. It is the kind of specialist historical site that becomes more useful every year it refuses to disappear.
Hammersly's Ironclads republishes an 1881 naval encyclopedia article on the rise of armored warships, preserving a contemporary technical explanation of how shells, armor, broadside ships and turrets changed naval warfare.
1812Privateers.org organizes privateer vessels, captains, letters of marque, prisoners, declarations, engagements, port records, and primary-source references from the War of 1812 into a searchable research site.
SeaForces is a sprawling naval reference site organized around ship classes, submarines, international fleets, naval aviation units, weapons systems, and special reports rather than a modern news-feed interface.
World Naval Ships is a sprawling naval-history index organized by country, ship name, class, losses, ports, photographs, expeditions, navy lists, and other categories stretching from nineteenth-century fleets into the modern era.
World War 1 Naval Combat is a personal reference site focused on British and German surface warfare, with battle pages, ship losses, dispatches, pictures, maps, and a wonderfully candid warning not to trust its crude cartography too much.
USSHelena.org grew from a veterans organization into a sprawling web archive covering four ships named Helena, reunions, crew collections, Pearl Harbor material, war diaries, photographs, memorials, and the memories of the people who served aboard them.
Gordon Smith's Naval-History.Net grew from a 1998 personal research site into a vast archive of naval casualties, memoirs, contemporary accounts and hundreds of thousands of transcribed ship-log pages.