Games in the Stealth genre

Half-Life: Residual Life is a single-player campaign for Half-Life from a South Korean team, which is a continuation of the Residual Point mod, where G-Man somehow reboots the space-time continuum, leading to an alternative timeline of events at Black Mesa, where you play as a scientist trying to escape to the surface.

Earl and Henry - an add-on that adds two new lords: Earl Mangonel, replacing/fixing Philip, and Henry V, replacing Saladin.

Diablo: The Hell 4 is the fourth entry in the The Hell mod series – a complete overhaul of the original Diablo. It features additional fixes, new content, new features, new game modes, and new classes.

The Ironman mod builds upon many core mechanics from The Hell 2, introducing a host of improvements and refinements. Most of these enhancements are tailored specifically for multiplayer and the dedicated Ironman mode.

Half-Life: Invasion Definitive Edition - an improved version of the original Half-Life: Invasion mod for Half-Life, which added HD textures, updated English G-Man voice acting, improved stability and fixed bugs.

Operation: Firestorm is one of the largest and most impressive mods for Generals Zero Hour. It significantly expands the game: adding 8 unique generals with their own ability trees, new units, buildings and superweapons, improving graphics, interface and sound, as well as expanding the tech tree.

Ra2Yr Modern Warfare Mod for Yuri's Revenge, which places special emphasis on realism and modern weapons.