Terrain for Rhino 3.0
Terrain for Rhino is a terrain modeling plug-in for Rhinoceros (commonly known as Rhino). This plug-in gives Rhino the ability to create a terrain mesh from a set of unordered points. The terrain mesh is created as a Delaunay Triangulation, which is regarded as the best method to create a... Terrain for Rhino is powered by PointLib, a state of the art terrain modeling library developed by SYCODE. ... The Terrain command has a single parameter called Search Radius. ... The Terrain command is scriptable so that you can add it to a script to automate your modeling tasks.
http://www.sycode.com/installers/terrain_rh30.exe - 2Mb - Download

Terrain for AutoCAD
Terrain for AutoCAD is a terrain modeling plug-in for AutoCAD. This plug-in gives AutoCAD the ability to create a terrain mesh from a set of unordered points, lines, polylines and splines. The terrain mesh is created as a Delaunay Triangulation, which is regarded as the best method to create a... Terrain for AutoCAD is powered by PointLib, a state of the art terrain modeling library developed by SYCODE. ... The Terrain command has a single parameter called Search Radius. ... The plug-in adds a new command to AutoCAD called Terrain.
http://www.sycode.com/installers/terrain_ac.exe - 2Mb - Download - Screenshot