OpenArena is a free, open-source FPS (First Person Shooter) game. It is based on the popular first-person shooter Quake III Arena, and is designed to be a fast-paced, intense gaming experience. It features a variety of game modes, including deathmatch, team deathmatch, capture the flag and various other team-based and objective-oriented modes. It also features a variety of weapons, maps, power-ups and other features to ensure that no two games are ever the same. OpenArena also features a variety of customization options, allowing players to customize their characters, weapons, and levels to their own liking. OpenArena is designed to be accessible to all levels of gamers, from casual to competitive, and is free to download on a variety of platforms, including Windows, Mac, and Linux.
Discontinued development has been discontinued, as stated on https://www.warsow.net/forum/thread/17216/1. The latest version, 2.1, released in March 2016, can still be downloaded from the official website.