Hundreds of modern firearms, specialized military gear, and the Hydrocraft mod (which adds thousands of crafting recipes from smelting steel to farming bees).
If you love the core loop of Project Zomboid but want more "flavor," a Vanilla+ pack is your best bet. These packs focus on and visual fidelity without changing the core mechanics.
Project Zomboid is arguably the most detailed zombie survival sim ever made, but even after hundreds of hours in Knox Country, the "Vanilla" experience can start to feel familiar. That is where the modding community—one of the most dedicated in gaming—comes in.
Always check if the pack creator lists a specific "Load Order."