Milly's Links www.iMilly.com
- Modify the way you see someone else's webpage.
- Extract data from a webpage.
- Search more quickly, and in ways not possible with a search engine.
- Navigate in new ways.
Well, for looking up words. Quick links to Thesaurus.com too. There are many other such sites (see below too), but I like this one for everyday lookups. Google uses it too. There's a Bookmarklet for it here.
For harder/deeper word/phrase searches, this site uses multiple other web sites - 4,897,834 words in 848 dictionaries indexed (at time of writing). There's a Bookmarklet for it here.
"The Internet Archive is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, and the general public."
There's a Bookmarklet for looking up archived web sites with its Wayback Machine here.
" ... the free encyclopedia ... a collaborative project to produce a free and complete encyclopedia in every language."