Prefabricator adds prefab support for Unreal Engine 4. It is free and open source.
More info here:
http://prefabricator.dev
Forum Support Thread: https://forums.unrealengine.com/commu...
Art Assets used in the video:
2:00 - Multistory Dungeons by Mana Station : https://www.unrealengine.com/marketpl...
0:20 - POLYGON - Sci-Fi City by Synty Studio : https://www.unrealengine.com/marketpl...
1:00 - POLYGON - City Pack by Synty Studio : https://www.unrealengine.com/marketpl...
2:18 - Proto Tools by Code Respawn: https://forums.unrealengine.com/commu...