The Quake III Arena sources as originally released under the GPL license on August 20, 2005.

q3radiant/RADKEYS.INI

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+; command mapping for QERadiant
+;
+; syntax is as follows
+; Command name = keystroke
+;
+; use +alt, shift or ctrl to modify the keys (you can combine them)
+; i.e.
+; EntityColor = k+ctrl
+;
+; the special keys are as follows
+;
+; UP        = Cursor up
+; DOWN      = Cursor down
+; LEFT      = Cursor left
+; RIGHT     = Cursor right
+; SPACE     = space
+; BACKSPACE = back space
+; ESCAPE    = escape
+; END       = end
+; INSERT    = insert
+; DELETE    = delete
+; PAGEUP    = page up
+; PAGEDOWN  = page down
+; TAB       = tab
+; RETURN    = return (enter)
+; F1..F2    = f1 .. f12
+
+
+[Commands]
+EntityColor = K
+CameraForward = UP
+CameraBack = DOWN
+CameraLeft = LEFT
+CameraRight = RIGHT
+CameraUp = D
+CameraDown = C
+CameraAngleUp = A
+CameraAngleDown = Z
+CameraStrafeRight = ,
+CameraStrafeLeft = .
+ToggleGrid = 0
+SetGrid1 = 1
+SetGrid2 = 2
+SetGrid4 = 3
+SetGrid8 = 4
+SetGrid16 = 5
+SetGrid32 = 6
+SetGrid64 = 7
+DragEdges = E
+DragVertices = V
+ViewEntityInfo = N
+ViewConsole = O
+ViewTextures = T
+SurfaceInspector = S
+CloneSelection = SPACE
+DeleteSelection = BACKSPACE
+UnSelectSelection = ESCAPE
+CenterView = END
+ZoomOut = INSERT
+ZoomIn = DELETE
+UpFloor = PAGEUP
+DownFloor = PAGEDOWN
+ToggleClipper = X
+ToggleRealtime = R
+EntityList = L
+MapInfo = M
+