Alternatives to Marathon 2

First-person shooter, first in a trilogy

First-person shooter, third in a trilogy

Open-source continuation of Bungie's Marathon 2 game engine

2D and 3D game engine

Playstation 2 Emulator

Real-time strategy game engine for Westwood games

GameStream client

Video game digital distribution service

Game launcher

C# scripting capable version of Godot game engine

First person shooter engine

Frontend for emulators, game engines and media players (OpenGL graphics API)