Fall From Heaven 2

Halo: GoldSource is a mod for Half-Life that recreates the atmosphere and gameplay style of Halo, including Slayer and Firefight modes, iconic weapons and maps from the original shooter, but runs on the GoldSrc engine.

Doom CE is a massive total conversion for GZDoom that combines PlayStation Doom, Final Doom, and Doom 64 into one mod. It faithfully recreates the atmosphere of the console versions, adding modern features and settings, restoring content that was absent on consoles, and introducing numerous visual improvements.

HoMM3 ERA STALKER is a large story-driven XL map-mod for HoMM3, inspired by the STALKER game series but not tied to any specific installment. The plot is only partially connected to the original to maintain recognizability, while being fully adapted to a fantasy world.

HoMM 3 HD Edition Remaster - a mod for HoMM3 ERA that replaces the game textures with textures from the official HoMM 3 HD Edition rerelease, and also applies additional fixes and improves AI performance.

Command & Conquer: Generals 2 is a Chinese developers' attempt to create that very sequel to Generals that was never released.