Games similar to Red Crucible include Uebergame, which is free and open source. Other options are Battlefield, War Thunder, Arma and IL-2 Sturmovik. You can choose from more than 10 First-Person Shooters like Red Crucible for Windows, Linux, Mac, iPhone and iPad.
A truly free and open source multiplayer shooter, no strings attached. Have casual deathmatch matches on various scenarios. Build your own levels with the ingame editor and assets that come with the game, or just play around and use it as a sandbox.
Germany
EU
Battlefield is a series of first-person shooter video games developed by Swedish company EA DICE and is published by American company Electronic Arts.
SwedenEU
War Thunder is a multiplayer online game combat flight game developed by Gaijin Entertainment for Linux, Microsoft Windows, Mac OS X, and PlayStation 4.
HungaryEU
Experience true combat gameplay in a massive military sandbox. Deploying a wide variety of single- and multiplayer content, over 20 vehicles and 40 weapons, and limitless opportunities for content creation, this is the PC’s premier military game.
CzechiaEU
IL-2 Sturmovik is a series of World War II combat flight simulator video games originally created by the Russian video game developer Maddox Games under the brand name 1C:Maddox Games, following its association with 1C Company.
CyprusEU
Experience authentic First World War action with 64 player battles of maneuver on the Eastern Front. Grab your rifle, ready your sabre and keep your gas mask close as you prepare to play a part in one of the most significant conflicts in history!.
NetherlandsEU
Day of Defeat: Source features multiplayer, team-based gameplay set in the WWII European theatre of operations. Players choose a role and tackle goal-oriented missions based on historical operations.
TrueCombat: Elite is a FREE modification for the Enemy Territory game (also free). It is a realistic modern day FPS featuring state of the art models and textures.
Free online shooter featuring multiple game modes, customizable weapons, numerous maps, both PvP and PvE gameplay, clan wars, and regular updates. Offers character personalization, dynamic events, leaderboards, and fast-paced, tactical multiplayer combat.
South Korea
Ravenfield is a singleplayer battlefield style game. It started out as an experiment with ragdolls and AI, and will remain a slightly experimental, for-fun game project.
United States
Post Scriptum is a WW2 simulation game, focusing on historical accuracy, large scale battles, a difficult learning curve and an intense need for cohesion, communication and teamwork.
United Kingdom
