This is a tool reminiscent of MTA:SA Map Editor days. You have a freecam to navigate around, and you can spawn objects (with preview!), move them around with your mouse or keys. Then you can save or load your map in various formats, currently supported are XML and Simple Trainer format (objects.ini).

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Map Editor

Map Editor

Full Version

Last version of Map Editor mod, available now. Download additional maps at an external site.