is the most comprehensive scientific research tool on the web. With over 370 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information.
Google Earth Engine brings together the world's satellite imagery-trillions of scientific measurements dating back more than 25 years-and makes it available online with tools for scientists, independent researchers, and nations to mine this massive warehouse of data to detect changes, map trends and quantify differences on the earth's surface
The free, open collaborative platform for complex problem solving. The system is intended for anyone curious and interested in solving wicked problems or investigating complicated unanswered questions.
"About WorldCat and is dedicated to offering you access to the widest possible range of resources. You are now able to search our collection and the collections of many other libraries worldwide using WorldCat, the world's largest network of library-based content and services."