Intense firefight with flaming demon in DOOM 3 Fan remake

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Quakespasm-Spiked (QSS)Quake (1996)
Quakespasm-Spiked (QSS) is an advanced, feature-rich engine based on Quakespasm that enhances classic Quake through improved performance, better networking, and expanded mod support. It preserves the look and feel of the original while adding improvements for both single-player and multiplayer.

Mental OmegaCommand & Conquer: Yuri's Revenge (2001)
Mental Omega is arguably the best mod for Yuri's Revenge and one of the most ambitious fan projects overall. It not only completely reimagines the original game but also significantly expands it, transforming it into an almost full-fledged sequel with a new storyline, campaigns, factions, and a massive amount of content.

Zero Tolerance (Total Conversion)Doom II: Hell on Earth (1994)
Zero Tolerance (Total Conversion) is a mod that ports the shooter Zero Tolerance (1994), originally released for the Sega Genesis, to the GZDoom engine. The mod recreates the original maps, sprites, and atmosphere that made the original game unique.

Half-Life: Residual LifeHalf-Life (1998)
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.

Fallout: Vault 666Doom II: Hell on Earth (1994)
Fallout: Vault 666 is a story-driven mod for Doom inspired by Fallout 1, which carefully blends the dynamics of a classic shooter with the atmosphere of a post-apocalyptic RPG. Players must venture into Vault 666 to find the water chip, battle mutants, and change the fate of the Wasteland.

IonizationHalf-Life (1998)
Ionization is a total conversion for Half-Life built on the Xash3D FWGS engine, inspired by PARANOIA. You play as an intelligence agent investigating mysterious events in a post-Soviet closed city called Oktyabrsk, gripped by a sectarian uprising.

OpenRCT2RollerCoaster Tycoon 2 (2002)
OpenRCT2 is an open-source engine for RollerCoaster Tycoon 2, allowing you to play on modern systems with enhanced features: improved interface, modding tools, and multiplayer support. In it, you can build amusement parks, design attractions, and share your created content.