Last of the Wild and Human Footprint Data
From their web page:This dataset was created to facilitate policy making aimed at conserving Last of the Wild.
WORLD (ENTITY)
Environmental Data Explorer
The Environmental Data Explorer is the authoritative source for data sets used by UNEP and its partners in the Global Environment Outlook (GEO) report and other integrated environment assessments.
Mineral Resources Data System [MRDS]
Mineral Resources Data System (MRDS): MRDS describes metallic and nonmetallic mineral resources throughout the world. Included are deposit name, location, commodity, deposit description, geologic characteristics, production, reserves, resources, and references.
Geonames
Google map based gazetteerp
DIVA Free GIS Data
Free Spatial Data along with free GIS software.
Marine Geology
Geology of ocean floors
Seamless Digital Chart of the World
This product is a globally seamless adaptation of the U.S. Government's Digital Chart of the World (Vector Smart Map Level 0 [VMap0], Edition 5) produced by Global Mapping International in ESRI shapefile format, with added country polygons and updated first-level subdivisions of countries.
World Language Mapping System
The World Language Mapping System (WLMS) is the result of over 15 years of collaborative work between Global Mapping International (GMI) and the Summer Institute of Linguistics (SIL), to map the over 6,800 languages described in SIL's 14th edition Ethnologue.