#4737
Tiled (full name: Tiled Map Editor) is currently the most popular, powerful and flexible tiled map/level editor for all types of 2D games, developed by Thorbjørn Lindeijer in 2008 (written in Java, therefore it's cross-platform). It is identified as an edge tool for 2D game developers to quickly create game maps.

#4641
CopperCube (successor of irrEdit) is a free 3D authoring editor, also the most user-friendly 3D game engine. It is developed based on the free and open-source 3D game engine - Irrlicht Engine (SWFZ Engine was rewritten from this engine too), and its essence is a simple, lightweight but powerful interactive 3D scenes designing software with concise and clear user interface, convenient operation, and humanized design. It is mainly used in the production of 3D application, 3D game, 3D website, and 3D animation.

#3481
MapInfo Pro, started in 1986, is a powerful and user-friendly business desktop mapping system (namely the GIS: Geographic Information System) with commercial information mapping and data visualization functions. It can help enterprises gain the maximum value from data in the process of decision making of inventory management, resource allocation and customer communication.

#1409
The 2D edition of Counter-Strike? Yes, if you are tired of playing the 3D edition of Counter-Strike, I do suggest that you try this 2D one. It is so interesting that players who like 2D game and CS should not miss it.