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(+1)

If you are using Unreal, there is also:

  1. The Epic Games created content: https://www.unrealengine.com/marketplace/en-US/profile/Epic+Games
  2. The Permentantly Free collection: https://www.unrealengine.com/marketplace/en-US/assets?tag=4906

Can we use assets that were given away during the monthly giveaways but have since become paid? Or just the permentantly free assets? 

(+1)

You can only use assets that are currently free for anyone to acquire. No paid giveaways, sorry.