Free To Play
Coming with the Hearthstone Ashes of Outland expansion, all players will get duplicate protection for all cards -- meaning they won't get any duplicate cards until they've collected every card at every rarity in a set, which was previously only applied to Legendary cards.
WoW is technically free to play.
Diablo Immortal is likely coming out very soon on mobile devices.
Update: This is now live, so get in game!
If you're one of the rare few who don't already own Overwatch, you're in luck. Starting November 17 through November 20, you can dip your toes into Overwatch and play for free. And when Blizzard Entertainment says free, they mean free. This isn't a feature-limited demo, but all the game has to offer: all 26 heroes, all 16 maps, the majority of its game modes, and unlimited progression within the free period. The only game mode that appears to be off-limits is competitive ranked, or at least, it isn't listed as one of the game modes available during this period.
First announced during BlizzCon 2017's Opening Ceremony, StarCraft 2 is officially free-to-play starting today.
Blizzard's first person shooter, Overwatch, is going free to play today through Sunday on the PC as well as the Xbox One and PlayStation 4.
Diablo 3 has always had a starter edition that let you get to level 12 before shelling out any cash, but now it looks like the game may be free to play up to level 70. Based on several changes to Battle.net's Diablo store this afternoon it's pretty clear that something happening...
Free-to-play Korean MMOs often get looked down on by Western audiences, but this one might deserve a second look.
Did you know that hidden within the StarCraft 2 Starter Edition, there exists a free version of StarCraft 2?