Ever wanted to explore the war torn 41st millenium, Mortal realms, or World that Was? I certainly have, and luckily for us Warhammer has a group of rpgs that let you jump into the boots of those worlds inhabitants. From the Massive Greaves of a mighty Space Marine to the worn sandals of a lowly Bretonnian they let you explore and expand the worlds in ways you never could while re-enacting grand battles with armies on the tabletop. 
It certainly doesn't hurt that the systems themselves are fun too!

For those looking to save (or destroy!) the galaxy's crumbling Imperium Warhammer 40K Wrath & Glory is the place to go.

If you'd rather face the forces of Chaos, Death, and Destruction in the Mortal Realms Warhammer Age of Sigmar: Soulbound is the perfect choice.

And for those who long for more grounded stories set before the End Times Warhammer Fantasy Roleplay is the best option.