Zandronum Alternatives

Freedoom is a WIP a complete free content game based on the Doom engine. It's not an engine, but it's replacement game data with entirely original content, Compatible with a majority of game mods made for Doom. Comes in Three Flavors~.

Tremulous is a free, open source game that blends a team based FPS with elements of an RTS. Players can choose from 2 unique races, aliens and humans. Players on both teams are able to build working structures in-game like an RTS.

Digital Paint: Paintball 2 is a Paintball game that started out as a mod for quake 2 but then took on a life of its own as an open source fps game with a global player and clan management system.

Dead Space is a survival horror third-person shooter video game for Microsoft Windows, PlayStation 3 and Xbox 360.

Welcome to the world of Combat Arms, a free online first-person shooter. Combat Arms has a huge library of modes, maps and weapons that will entertain players of all skill levels from new players to guilds of veterans.

The Lord of the Rings Online (LOTRO) is the first MMORPG set in the world of J.R.R. Tolkien's The Lord of the Rings. LOTRO takes place in a persistent online world and is free-to-play.

Aliens vs. Predator is a science fiction first-person shooter video game, developed by Rebellion Developments

The game is inspired by such classic titles as Quake and Doom, with the emphasis on killing large numbers of monsters. The game is divided into five chapters, each about five levels long. The player's objective is to get through each level, from start to finish, by...

Crispy Doom is a source port developed by Fabian Greffrath forked from Chocolate Doom which provides a higher display resolution, removes the static limits of the Doom engine, and offers further optional visual, tactical and physical enhancements while remaining fully compatible...

Developed by id® Software, the creators of DOOM® and QUAKE®, RAGE is a groundbreaking first-person shooter set in the not-too-distant future after an asteroid impacts Earth, leaving a ravaged world behind.

Source of Mana is a classic 2D MMORPG that blends the nostalgic charm of retro RPGs with modern gameplay enhancements. Set in a rich fantasy world, the game invites you to embark on epic adventures, discover new lands, battle fierce enemies, and forge friendships along the way.

Alien Arena is a free and opensource first-person shooter game that combines a 1950s-era sci-fi atmosphere with gameplay similar to Quake , Doom and .