At the moment the store only hosts six titles, out of which only three are third-party: Hades by Supergiant Games, which was announced as an early access title at The Game Awards; Ashen by Annapurna/A44, which just released on Xbox as well; and Hello Neighbor: Hide and Seek by tinyBuild. The other three titles available on the store are Epic Games’ own Shadow Complex, Unreal Tournament and, of course, Fortnite.
The Epic Games Store will also be making available one free game every fortnight for the entirety of 2019, all paid for by Epic. Subnautica is the first game that will be available for free, starting from December 14 until December 27.
If you're running AMD graphics, they've released a hotfix driver with just one new item, support for Epic Games.