Blitz ToolBox/3D Terrain Tools

Name	Description	Website
EG Heightmap Companion	Create high res colormaps easily
FLE free old version	An early version of FLE when it still was an open source project
MapCrafter	Create 3D maps with scenery in minutes
Panorama - Terrain Editor	Features multitexturing, a lightmapper, and three exports formats, plus more.
Total Terrain	Full featured Terrain Editor and Painter!