I have listed some of the best useful Unreal Engine Assets Packs which are available free that can be used in your Games or Simulations and Architecture Visualizations.
1. Vehicle Variety Pack
Pack of 5 fully game ready, drivable vehicles with interiors for you to drop and use in your projects. Includes, Sports Car. Hatchback, Pickup, SUV, Box Truck (with and without Box)
2. Scanned 3D People Pack
ready-to-use 3D People models to populate your Unreal projects. This pack contains a set of 9 photorealistic scanned 3D characters that are specifically designed to enhance the vividness and realism of renderings, like architectural visualization.
3. Construction Site – Tools, Parts, and Machine Props
This project includes everything pictured with all assets, maps, materials, Blueprints, and effects created in the Unreal Engine. Each asset was created for realistic AAA quality visuals, style, and budget.
4. Hollywood Movie Props VOL.3
This project includes everything pictured with all assets, maps, and materials created in the Unreal Engine. Each asset was created for realistic AAA quality visuals, style, and budget.
5. Modular Scifi Season 2 Starter Bundle
The perfect product for getting started on scifi projects in UE4. This bundle includes the first 3 packs of the Modular SciFi Series’ Engineer Collection. Included is are example environments demonstrating how to utilize all 3 products together to create richly detailed, stunning scifi environments.
6. Horror Engine
Complete First-Person Horror Game Kit. Everything you need to create your game and storyline! With this kit, you will have Endless Possibilities and Combinations for your story! Determine your rules and create your custom horror events
7. Isometric – Interiors
Isometric 3D Series House Interior Asset Pack. This pack contains a lot of assets for you to create your own isometric house interiors themed game! The props and environment assets are low poly. Layout them easily and create your own game environment.
8. Modular Building Set
A Modular Building Set that can be used to create hundreds of unique buildings. This Modular Building Set is designed to give developers complete creative freedom and control over building sizes, shapes, colors, styles, and structures.
9. 4K Materials: Wood Flooring Vol.01
4K Materials: Wood Flooring contains 25 customizable PBR wood flooring materials with 4K textures. Also ideal for ArchViz & VR.
10. M5 VFX Vol2. Fire and Flames
M5 VFX vol.2 can produce various kinds of fire. This asset includes assets such as shaking candles, bonfires, fire, flames, and explosions. Small fire to large fire can be expressed. You can apply preset flames by using Blueprint props. High-quality image sequence textures are included.
11. Furniture Pack
37 free high-quality furniture models for your project, some models have openable drawers/doors for interactions.
12. Vista Mountain Pack – Grasslands
Comes with 3 massive vista mountain meshes for your backgrounds. 4k textures for everything, but you can easily lower the resolution to match the needs of your project with the LOD Bias feature in UE4
13. Procedural Nature Pack
Procedurally Generate almost any nature scene you can think of with these assets!
14. GOOD SKY
GOOD SKY is a pack that helps you to add some skybox effects for the environment to your game. This is simple to use, just drag it to your scene. Add customizable sun, moon, star, and even storm effects.