WorldClim is a database of high spatial resolution global weather and climate data. It offers gridded weather and climate data for historical (near current) and future conditions.

CHELSA (Climatologies at high resolution for the earth’s land surface areas) is a free, very high resolution (30 arc sec, ~1km) global downscaled climate data set, constantly updated and refined. It includes climate layers for various time periods and variables, from the Last Glacial Maximum to the present and to several future scenarios.

The Global Forecast System (GFS) is a weather forecast model that generates data for dozens of atmospheric and land-soil variables, including temperatures, winds, precipitation, soil moisture, and atmospheric ozone concentration.

Global digital data layers in support of hydro-ecological research and applications worldwide. 

CLMS offers a wide range of environmental data. One important example is the land cover maps of Europe.

Free OpenStreetMap Data Extracts 

Data portal hosts information information and knowledge to enhance the development and implementation of effective, high-quality linear infrastructure safeguards in Asia.

The most comprehensive global database of marine and terrestrial protected areas