Ground2K4 5.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. Ground2K4.exe is the default file name to indicate the Ground2K4 installer. The actual developer of the free software is Chrsitian Fumey. The most popular versions of the program 5.1 and 5.0. The program lies within Games, more precisely Utilities.
From the developer:
Ground2K is a very easy to use design tool for Flight Simulator terrain scenery. With it, you can create and modify coasts, roads, rivers, lakes, islands, land and water class, altitude mesh, and textured ground polygons.
This short user guide is meant for beginners, and presents some basic concepts concerning Flight Simulator terrain, and a step-by-step explanation of some of the principal functions of Ground2K.
You may want to check out more software, such as GW Team Builder, Abfluege Online or CubeTwister, which might be related to Ground2K4.