Requires: .Net Framework 4.0 or better
Here's a little tool that displays the descr_geography.db in human readable format. Any setting from descr_geography.txt as well as the colours associated with each texture can be modified. You can change the texture names, the colours associated with each texture, any value in any of the tables and the global generation values. This includes the ability to enable textures that previously did not exist for a particular climate (i.e. forest_dense texture for the swamp climate).
Download here.