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Game · FPS & shooters

Reaction

Reaction is a shooter, available on Linux: mod support.

  • Completely free
  • Linux
  • Open source

Overview

Reaction is a shooter, available on Linux.

Gameplay elements described in its GitHub repository: mod support.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information
  • “Movie realism first-person-shooter” — Flathub, 10 November 2026
  • “The intent of this project is to provide a baseline engine which may be used for further development and to play _Quake 3: Arena,_ _Team Arena,_ and mods.” — GitHub, 10 November 2026

At a glance

Reaction is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-2.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

  • Open source code
  • Commercial use allowed

About

Reaction Quake 3 ports Action Quake 2 to idTech3 for better graphics and enhanced gametypes like Teamplay, Team Deathmatch, and Capture the Briefcase. It adds fast paced gameplay with realistic weapons and damage. It adds a variety of movement options such as strafe, ramp, ladder, and double jump.

Description from Flathub — AppStream (Flathub)

Sources and checks

  • Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) —
  • Facts collected from LicitPro automatic classification () —
  • Last technical check: 8 November 2026
  • Description from Flathub — AppStream (Flathub)

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