Left 4 Liberty Infection - a mod that plunges Liberty City into infectious nonsense and lawlessness, flavored with hordes of zombies.
Features: there are a lot of them. But there are basic ones. For example, you can double the density of zombies compared to the default traffic settings. You can switch the style of zombies (fast or classic). You can spawn three survivors to help (a criminal, a doctor and a mafia). You can use incendiary cartridges. You can fix your car. You can heal and heal. And much more.