One of the best selling games of all time and still a top seller is free this week on the Epic Games Store. 

Grand Theft Auto V - Premium Edition is free to anyone with an Epic Games Store account.  

The Grand Theft Auto V: Premium Edition includes the complete GTAV story, Grand Theft Auto Online and all existing gameplay upgrades and content. You’ll also get the Criminal Enterprise Starter Pack, the fastest way to jumpstart your criminal empire in GTA Online.

If you receive the following error:

"Your account is unable to download any more free games at this time."

then wait 24 hours and try again.  The Epic servers are being smashed by the sheer number of people who want this game.   The servers at Epic were down for over 12 hours on May 14th as players scrambled to get this game.  

If GTA V isn't enough the Annual Mega Sale at Epic Games is also going on right now.