Virtual Tabletop Fantasy Grounds has been the licensed VTT for Dungeons & Dragons 5th Edition for a while now. The price point can be a little steep for those who just want to try it out, so Smiteworks has just announced a free 30-day trial (you have to sign up then cancel before it's up) and also that the D&D Basic Rules are now included in all Licenses and Subscriptions (other than the demo). That's the four basic 5E reaches and classes, plus 120+ spells, equipment, and the basic rules reference. It also includes, of course, other game like Call of Cthulhu, Castles & Crusades, and Savage Worlds.