A mapmaking app from Bungie, used for creating maps. Bundled with Myth II: Soulblighter
In Myth-speak, Loathing is used to combine a colormap with elevation information, scenery/unit placement, terrain information, scripting information, etc to make a mesh/map
As of early 2014, the latest version of Loathing (& Myth) is v1.8. An updater can be found here, and the related Loathing 1.8 documentation here.