Epic just released a pretty awesome pair of assets packs completely free for Unreal Engine developers. Soul:City and Soul:Cave are both AAA quality packs containing maps, models, textures, blueprints and more for creating a futuristic city as well as a cave environment. The only real catch is the license requires the assets be used only in Unreal Engine projects, which seems reasonable enough all things considered!
Details of the two packs:
Soul City
Texture Sizes: 256, 512, 1024, 2048
Collision: Yes
LODs: No
Number of Meshes: 419
Number of Materials and Material Instances: 234
Number of Textures: 198
Supported Target Build Platforms: Desktop, Mobile
Usage: Licensed for use with the Unreal Engine only.Soul Cave
Texture Sizes: 256, 512, 1024, 2048
Collision: Yes
LODs: No
Number of Meshes: 173
Number of Materials and Material Instances: 167
Number of Textures: 171
Supported Target Build Platforms: Desktop, Mobile
Usage: Licensed for use with the Unreal Engine only.
You can read more about the release and download both packs from this link. For a quick video showing the assets in action check here or the video embedded below.