Earth.nullschool.net, created by Cameron Beccario, is a beautiful and everchanging visualization of global weather conditions, ocean surface current estimates, ocean waves and surface temperatures, and aurora, forecast by NOAA supercomputers and updated regularly.
A rich thesaurus that "lets you find any kind of word for any kind of writing." As with a traditional thesaurus, you can find synonyms and antonyms but are also able to search by description of the kind of word you need.
A fun history of food through time, from water and ice through Kool-Aid pickles.
Originally created and edited by Lynne Olver, now housed at Virginia Tech University Libraries and the College of Liberal Arts and Human Sciences.