There are plenty of great assets at blendswap that need a little tweaking to get into UE4. Here are some already done for you. They are all CC0.
AK47
Henry Repeating Rifle
Antique Chair
Armchair
Simple Teapot
Table Rickety
Created for my tileable texture tutorial.
Place the "Stonewall" folder in your project's content folder. Project must be UE4 4.12 or later.
This content is free to use for any purpose, even commercially, without need for attribution. You are not permitted to sell a product where the majority of the product consists of this content or its derivatives.
For engines other than UE4, the images can be gotten here.
You can use the water for shallow pools with the opacity low, or deeper water with the opacity high.
The glass material is exceedingly simple for how good it looks.
In case the download no longer works with your version of Unreal, a guide to replicating the materials is here.
These are free to use for any purpose, even commercially, without need for attribution. You are not permitted to sell a product where the majority of the product consists of this content or its derivatives.
A sawhorse modelled with accurate dimensions.
Archvis quality, cycles render .blend file available on blendswap.
Realtime mesh with collision primitives also available. You will have to create your own UE4 materials, however the hard part is done - tiling wood texture(s) included - diffuse, normal, height, roughness.
Contents are free to use for any purpose, even commercially, without need for attribution.You are not permitted to sell a product where the majority of the product consists of this content or its derivatives.
Available on the Unreal Marketplace, the plugin is an advanced version of the code created in my 5 part youtube tutorial series.
The marketplace asset also contains extra features like path prediction and tracer effects, as well as three complimentary materials: plywood, pockmarked concrete, and steel checkerplate. These inherit from a PBR base material with bump/parallax mapping, which can be reused.
Owners of the previous product version can download here.
The example project for owners of the plugin is here.
The demo game (no purchase required) can be downloaded here. 122MB