J.A.C.K.

6.4easy start · #12 of 27
in Game Level Editors

Runs on Linux, Mac, Windows.

J.A.C.K. is ranked #12 of 27 in game level editors on The Geeks Club. It runs on Linux, macOS, Windows.

J.A.C.K. plans and pricing

Steam version $14.99 once Purchase on Steam · access to beta updates jack.hlfx.ru · 2 Oct 2026

GridCraft 0 of 4 in the starter kit Lesson 17.3 Remere's Map Editor 0 of 4 in the starter kit Lesson 27.3 LDtk 0 of 4 in the starter kit Lesson 37.1 2D Tiler 0 of 4 in the starter kit Lesson 47.0 Hammer++ 0 of 4 in the starter kit Lesson 57.0 Sprite Fusion 0 of 4 in the starter kit Lesson 67.0

Purpose: J.A.C.K. is a level editor for games using Quake-style BSP architecture.
Intended users: The editor aims to serve people designing levels for classic games and mods, including Quake and Half-Life.
Supported games: The editor supports Quake, Half-Life, Quake II, Quake III, and Hexen II.
Map formats: It can import and export VMF maps, though VMF support is beta and does not include Displacements.
Extensibility: Plugins can add capabilities such as brush primitives, texture and model formats, and game configurations with import and export formats.
Editing tools: Features include curved surfaces, triangulation, UV-Lock, multiple VisGroups, and automatic selection in 3D views.
Map size: The editor supports levels up to 262144 × 262144 units.
Autosave: Users can configure autosave to protect projects from editor crashes or design errors.
Distribution: J.A.C.K. is donationware distributed freely, and the donation amount is up to the user.
Support: Users can submit error reports and feature requests through the project forums; the software is provided without warranty.
Downloads: The official download page lists Windows and 32-bit and 64-bit Linux packages.
Development: The maker says J.A.C.K. has been in development since August 2013.

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