Esri ArcGIS Online is a web mapping platform that allows you to easily create, edit, analyze, share and publish geospatial data. To read about all that ArcGIS Online has to offer, check out its official website. The U-Spatial Help Desk offers training sessions.
Search literature on the earth sciences, ecology, geology, human and physical geography, environmental sciences, oceanography, geomechanics, alternative energy sources, pollution, waste management, nature conservation and more.
The World Factbook, produced for US policymakers and coordinated throughout the US Intelligence Community, marshals facts on every country, dependency, and geographic entity in the world. It provides information on the history, people, government, economy, energy, geography, communications, transportation, military, and transnational issues for 250+ world entities.