Overview
Dungeon World is a tabletop fantasy roleplaying game created by Sage LaTorra and Adam Koebel. The game uses the
Powered by the Apocalypse
engine. The game is advertised as having old school style with modern rules.
The game uses six ability scores (Strength, Dexterity, Constitution, Intelligence, Wisdom, Charisma) and a character class model with choices of Bard, Cleric, Fighter, Immolator, Paladin, Ranger, Thief, or Wizard.
System Overview & Key Features
Classic Fantasy Adventure
Explore a land of magic and danger in the roles of adventurers searching for fame, gold, and glory. Delve into goblin holes or chance a dragon's lair. Dungeon World takes classic fantasy and approaches it with new rules.
Talk About What Matters
Dungeon World's simple rules happen based on what's happening within the game, so you spend more time talking about the action and less time talking about the rules.
Gamemaster's Toolkit
Running a game shouldn't be a pain. Dungeon World gives the GM all the tools to run a game quickly and easily. Fronts help you keep the world around the players living and evolving. Moves are ways to drive your game forward. And your Agenda keeps you on track.
No Dead Ends
The rules always drive the action forward in unexpected ways. Rolling the dice always leads to an interesting outcome.
Award-winning Design
Dungeon World has won
an Ennie for Best Rules 
http://www.ennie-awards.com/blog/about-us/2013-noms-and-winners-2/?ref=dungeon-world.com,
a Golden Geek for Best RPG http://boardgamegeek.com/thread/886607/2012-golden-geek-awards-winners?ref=dungeon-world.com, and an Indie RPG Award.
Open License
The text of Dungeon World is released under a Creative Commons Attribution license. You can make, distribute, and even sell anything you like based on Dungeon World.
Additional links
dungeon-world.com https://www.dungeon-world.com/ - Official website