J.A.C.K. review
A focused editor for building, scripting, compiling and managing Quake-style maps.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
J.A.C.K. is a desktop level editor for modders and level designers working with games built around Quake-style BSP architecture. It targets projects connected to Half-Life, Quake, Quake II, Quake III, Hexen II and related games. Its core workflow combines brush-based map creation with resource handling, format support, scripting, compilation and tools for working on larger environments. Windows, macOS and Linux are supported across the product’s distribution options, with official downloads available for Windows and Linux and a Steam edition listing requirements for all three platforms.
The editor’s strongest area is the depth of its mapping workflow. It supports MAP, RMF and VMF map formats, loads resources from PAK and PK3 archives, and works with additional formats including WAD2, WAD3, MDL, MD2, SPR, SP2, FGD, JMF, PRT, P0-P3 and Quake III shader files. An embedded shader editor adds syntax highlighting and autocomplete, while plugin extensibility allows game configurations and resource formats to be extended. In-editor compilation, texture tools, curved surfaces and large-map editing keep key parts of the workflow together.
J.A.C.K. suits creators who want a specialized Quake-family editor with broad format coverage and a free donationware distribution. The separate Steam edition adds Steam distribution, Steam Cloud and Steam achievements, while autosave is available as part of the editing experience. Buyers focused on modern engines, general-purpose 3D design or workflows outside Quake-style BSP games should look elsewhere. For classic game modding, however, its combination of map editing, archive loading, shader scripting, plugins and compilation gives it a clear, narrow focus.
J.A.C.K. pros and cons
- Where it wins
- Supports Quake-style BSP editing, curved surfaces and large maps
- Loads PAK and PK3 archives and supports broad map and resource formats
- Includes shader editing, plugins, autosave and in-editor compilation
- Where it doesn't
- The free download is distributed as donationware
- Official downloads cover Windows and Linux
- Steam-specific features require the Steam edition
J.A.C.K. fact sheet, pricing and score →
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