Tractor Guide is a free Android application developed by Vaidas D. that is designed for use in tractors or other agricultural machinery. The main feature of the app is to mark a trajectory when the tractor moves, which can be useful when spreading fertilizer in large field areas with non-regular shapes.

The application is easy to use and provides accurate information about the path taken by the tractor. It is a helpful tool for farmers who need to navigate through large fields efficiently. Tractor Guide is a great addition to any farmer's toolkit and can save time and increase productivity.