Unreal Tournament 4

Unreal Tournament is a cancelled first-person arena shooter video game developed by Epic Games. It was planned to be the ninth game in the Unreal franchise, the fifth game in the Unreal Tournament series, and the first entry since 2007's Unreal Tournament 3. The game utilizes Epic's Unreal Engine 4 and was planned for release for free on Microsoft Windows, OS X, and Linux. The game was released as a pre-alpha on August 13, 2014, but never completed due to Epic Games' focus on Fortnite Battle Royale.

Unreal Tournament's development was crowdsourced and open to contribution from anyone with Epic Games using forums for discussions and Twitch livestreams for updates. The source code of the game was published on GitHub