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NoiseTool is a front end for the LibNoise library that let you manipulate noise modules and view their output in realtime, bu connecting outputs to sources. It can apply colour gradients to the data to create bitmap image representations, much like the original noise library utils can do.
I use this noise library a lot to create heightmaps, voxel maps and procedural textures, and I got tired of playing with numbers in code and not really getting to see what it is that the numbers are doing without rendering the whole scene in game. I created this tool to help me see exactly what types of images I will get, if certain noise modules are connected a certain way.