Terrain Group, Inc.
Terrain Group provides engineering, planning, and surveying services across Canada. We pride ourselves on our ability to offer practical, cost-effective solutions and designs
http://www.terraingroup.com/

Solid Terrain Modeling
STM creates physical 3D terrain models from digital data.
http://www.solidterrainmodeling.com/

Survey, Cogo and Drafting
Coordinate Geometry, DTM, Land Development, Land surveying and point manipulation software for Surveyors, Engineers and Architects, Section Tools, Sewer profiles, Design Parking, and free AutoLISP for IntelliCAD and AutoCAD
http://www.cogosoftware.com/

ARGO
An amphibious all terrain, off-road All Terrain Vehicle with 6x6 and 8x8 models, including Conquest, Bigfoot, Centaur, Vanguard and Response, as well as commercial utility vehicles.
http://www.argoatv.com/

Cadastral Survey Reference Page
Cadastral Survey Information for the Land Surveyor involved in the survey and retracement of the Public Land Survey System
http://www.cadastral.com/

TERREX
Terrain Experts Inc, a privately held software company that develops, markets, and supports software for Realtime 3D Terrain generation.
http://www.terrex.com/

Generating Terrain
An older (1996) collection of documentation, source code, and programs for generating and visualizing terrain.
http://www.geocities.com/Area51/6902/terrain.html

Height Map Editor
Edits, generates, and manipulates terrain height maps. These can be used in terrain renders, which are used in games, applications, and demos. Web based manual available. [Windows and Linux]
http://hme.sourceforge.net/

OpenGL Terrain Engine
An experimental OpenGL interactive terrain viewer with surface textures, clouds and reflective water capabilities. (free, with code) [Win32]
http://ohad.visual-i.com/exper/exper.htm

Terrestris
Terrestris, the Best MP3 plugin, ever!
http://www.freewebz.com/terrestris