Master of Puppets

OpenRA is an open-source engine that recreates classic RTS games from the Command & Conquer series and Dune 2000. It rewrites the original engine from scratch, supports modern operating systems, online multiplayer, improved graphics and modifications, but requires the original game files for full functionality.

The End of Days is a large-scale mod for Generals Zero Hour that adds a full-fledged Russian faction, updates USA, China and GLA with new units, buildings and upgrades. It emphasizes realism, introduces a specialization system for all sides and significantly reworks the balance.

Heroes of Might and Magic III: In the Wake of Gods is a major fan-made mod that significantly expands HoMM3. It introduces new hero specializations, city destruction and reconstruction, level 8 creatures, emissaries, commanders with unique abilities, new artifacts, map objects, and additional tactical combat options.

Sven Co-op is a cooperative mod for Half-Life where players team up to complete the campaign and custom maps together, featuring improved AI and new gameplay features.

They Hunger: Rebuild is a mod aimed at completely rebuilding the original They Hunger, gradually expanding old locations and adding new content.