Black Mesa: Classic

Half-Life Prison is a story-driven mod for Half-Life where the player finds themselves in a grim prison engulfed in chaos following experiments and an alien invasion.

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.

Half-Life: Dead Zone is a Half-Life 1 mod from one of the creators of Half-Life: Field Intensity and Half-Life: Induction. You are an ordinary scientist from the Black Mesa research center. After the facility was captured by Black Ops special forces agents, your task is to survive and escape to freedom. The main thing is not to fall into their hand

Pro Gen Mod: Unofficial Extension — an addon for Pro Gen Mod v2.6: Director Cut, which evolved from a Challenge mode update into a major expansion. It fixes bugs, refines generals, adds cut units and features, eliminates crashes on Challenge mode maps, improves balance, AI, and stability.

Half-Life - MMOD Reanimated Pack - a patch that improves the animation of all weapon models in Half-Life MMOD.