A level editor (also known as a map, campaign or scenario editor) is a software application used to design levels, maps or campaigns for a computer or video game. Sometimes a level editor is integrated in the game, and is an integral part of the game. Other times (and most often), it is a separate part of the game.
From : http://en.wikipedia.org/wiki/Level_editor
Quake Army Knife QuArK
A powerful editor for games based on or similar to id Software's series of Quake games. Currently supports 27 distinct games, and a countless number of mods. Integrates a map editor, model editor, archive editors and texture management.
Features of QuArK :
Map-editor for many games: Quake 1, Hexen 2, Quake 2, Heretic 2, Half-Life, Sin, Kingpin, Soldier of Fortune, Quake-3:Arena, Star Trek:Voyager-Elite Force and a few more...
Unique and editable tree-view display, which shows objects that the map/model consists of.
3D preview with software-, OpenGL- and 3Dfx(Glide)-render.
Colored lights in OpenGL 3D preview.
2-, 3- and 4-view layout of map-editor.
Textured view edit in map-editor.
Texture-browser with textures neatly grouped into categories.
Mirror-, Duplicator- and Hollow-maker functions for easy map-making.
Extendable with plug-ins, coded in Python.
Negative brushes - creates a movable hole, no more redoing your carving/brush subtraction.
Bezier/patch editing, with helper functions to ease creation.
Manipulate brushes, textures and entities directly in the 3D windows.
Player-, monster- and item-models viewable in 3D preview. (Not all games)
Unique high accuracy of brush- and texture-alignment in map-editor. (May require special build-programs)
Mailing-lists supplied by YahooGroups, for easy communication to and from QuArK users.
Project-explorer to keep all files of the TC/PC/MOD collected in one file.
Model-editor (Not all model formats are fully supported)
Customizable keys, mouse-buttons, colors and more.
Extremely newbie-friendly map-editor, very different from other popular map-editors, with context help and intuitive functions.
Features of QuArK :
Map-editor for many games: Quake 1, Hexen 2, Quake 2, Heretic 2, Half-Life, Sin, Kingpin, Soldier of Fortune, Quake-3:Arena, Star Trek:Voyager-Elite Force and a few more...
Unique and editable tree-view display, which shows objects that the map/model consists of.
3D preview with software-, OpenGL- and 3Dfx(Glide)-render.
Colored lights in OpenGL 3D preview.
2-, 3- and 4-view layout of map-editor.
Textured view edit in map-editor.
Texture-browser with textures neatly grouped into categories.
Mirror-, Duplicator- and Hollow-maker functions for easy map-making.
Extendable with plug-ins, coded in Python.
Negative brushes - creates a movable hole, no more redoing your carving/brush subtraction.
Bezier/patch editing, with helper functions to ease creation.
Manipulate brushes, textures and entities directly in the 3D windows.
Player-, monster- and item-models viewable in 3D preview. (Not all games)
Unique high accuracy of brush- and texture-alignment in map-editor. (May require special build-programs)
Mailing-lists supplied by YahooGroups, for easy communication to and from QuArK users.
Project-explorer to keep all files of the TC/PC/MOD collected in one file.
Model-editor (Not all model formats are fully supported)
Customizable keys, mouse-buttons, colors and more.
Extremely newbie-friendly map-editor, very different from other popular map-editors, with context help and intuitive functions.
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Reference Links

Map editors, level editors