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The Internet Sacred Texts Archive
A collection of assorted sacred texts, histories, and esoterica from across the world. As a general rule all translations here are in the public domain. Has USB sticks with the entire collection for sale. Also, follows old-school HTML design principles. Funnily enough, this is also where I first read the Iliad - the Butler translation they have here is pretty good.
The Christian Classics Ethereal Library
The CCEL has an extensive collection of ebooks of public-domain translations of specifically Christian books, but in addition to that they also have the complete works of Josephus and the like. Maybe the jewel of the collection is the entirety of a 19th-century translation of the works of the Church Fathers.
Project Perseus is the internet's finest collection of classical works. They have everything, complete with side-by-side comparison to the original text for those fortunate enough to read greek and latin. If you're interested in classics in general I highly recommend the Landmark collections for their maps and supplemental material, but this is pretty good too.
Yale's Avalon Project is a collection of treaties, agreements, and other diplomatic documents which have been digitized. It mostly contains documents the United States is party to, but it also has the Treaty of Westphalia so it's not exclusively that.
I'd be remiss in not mentioning Project Gutenberg, the internet's largest library of free ebooks not called Library Genesis. Unlike LibGen, Gutenberg is entirely public-domain.
An extensive collection of historical pictures from World War 2, sorted according to country, time, event, and even which types of equipment are present here. Extremely useful.
CombinedFleet.com is authors Jonathan Parshall and Anthony Tully's website on the Imperial Japanes Navy during World War 2, with a database of ships, tabular records of movement, and battles. They're most famous for Shattered Sword, a revisionist account of the Battle of Midway that throws into question conventional understandings of exactly what it was that went so fatally wrong for the IJN in June of 1942.
The alternatehistory.com forums are a long-standing institution of the internet, and a direct continuity from UseNet. My personal recommendations are Decades of Darkness and especiallyLook to the West - both are sprawling long-term projects which, starting from a point of divergence in the 18th century, lead to a completely different 20th century. Look to the West in particular is not just an alternate history, but an alternate historiography as well.
SpaceBattles, and Sufficient Velocity
The venerable SpaceBattles forums and its spin-off the slightly less venerable Sufficient Velocity split for various reasons in the early 2010s, but still have a significant overlap in userbase and interests. Generally speaking, SpaceBattles is more focused on fiction and debates over who would win in a fight, while Sufficient Velocity is more focused on forum roleplay and Quests. For much of the 2000s and 2010s, the two sites were also notable for producing a lot of the web's best fanfiction.
EvaGeeks was the hub of the Evangelion fandom for a very long time, and its forums still have a lot of stuff left over from the old days. Pretty much anyone who's anyone posted there at some point or another.
The Paradox Plaza forums, recently redesigned to look significantly worse than they used to, have a lot of great fiction as well. In particular, the AAR section has a few real gems.
OpenRA is an open-source remake of the original Command and Conquer and Command and Conquer: Red Alert. While the remake does require the files from the original game, it is possible to download the files from the 2007 freeware release of the game, which includes the graphics files but none of the original music or FMV files. Fortunately, both are available on Youtube. The game's pretty good!
Freeciv and Freecol are free open-source remakes of Sid Meier's Civilization, Sid Meier's Civilization II, and Sid Meier's Colonization. If 4x games are your speed and you enjoy the thought of spending hours micromanaging production chains, god help you but you might just enjoy these.
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