From Unreal's blog comes a laundry list of free stuff for developers in the month of August. Here are some of the highlight, as part of their partnership with creators in the Unreal Engine Marketplace:
Dynamic Combat System - Magic: Made for third-person combat system includes features for zooming and mothing, equipment and inventory, as well as 80 animations!
Environment Set: An expansive selection of trees, shrubs and other greenery so you can build your own wildland.
Footsteps Sounds with Blueprint Setup: A set of realistic audio for footsteps, rattles and grunts for characters that have to use two legs to get around. It even includes settings for different types of ground/floors