Wolfram Alpha, the "computational knowledge engine" that's steadily updating, has a good but hidden use as a word and language tool for use while writing. In other words, it can be a smart and snappy thesaurus/dictionary/translator/anagram tool.
Wolfram Alpha's own blog toots its own language skills horn a bit, but for good reason. If you've ever been stuck trying to fill out a trio of words ending in "ation," looking for the transliteration of a foreign script, finding proper pronunciation or hyphenation, or other nerdy word tasks, Wolfram Alpha can often pull off the job with a few key words. Enter word before your term to get an overview of what Wolfram knows about a phrase, or words starting with or words ending with to fit a certain phrase into your text.
Hit the link for a full read on what Wolfram can do with words, and tell us your own web word tools and tricks in the comments.