OpenTopography >
High-Resolution Topography Data and Tools
DATA.GOV.UK - Environment Agency Geomatics Survey Data >
Direct link to the map viewer: https://environment.data.gov.uk/ds/survey
USGS - The National Map >
Direct links to the map viewers: https://viewer.nationalmap.gov/advanced-viewer/ and https://viewer.nationalmap.gov/basic/
MapBox-Houdini bridge in Game Tools (vimeo, starts at 51:30) >
Exprore the Earth directly in Houdini then download the elevation model and textures of the selected area easily. Dope!
Here are the links for the Game Tools
HiRISE Mars DEM >
HiRISE (High Resolution Imaging Science Experiment) is the most powerful camera ever sent to another planet, one of six instruments onboard the Mars Reconnaissance Orbiter.
NASA Mars Trek >
Topleft corner's Tools button > Generate 3D Print File
NASA Moon Trek >
Topleft corner's Tools button > Generate 3D Print File