This is a pretty cool tool. It allows you to create your documents online and share them with others - others who can read, review, or be co-authors and make edits. A group of people in the #nanowrimo chat room helped me play with this and we had a fun time with it. Sign-up is required for all parties but it's free. Suggested by dream_weaver.

Crawford Kilian has created an outline breaking down the steps of writing various different projects and advice on how to handle each step. Everything is covered here, from developing the habits to make you a better writer to reading and understanding your publishing contract. Suggested by the wonderful dream_weaver.

GoodSearch is a search engine that donates a penny to the charity of your choice every time you use it. Do your research and help your favorite cause (like the Office of Letters and Light!) at the same time.

A one-word based sixty second writing exercise. How far can you get before time runs out? Recommended by Potnpayday.

This free 'productivity suite' comes with lots of fun things to get you in gear but probably most important for NaNoers both avid and casual - is a great word processor, similar to Word/Works/Word Perfect.

Fellow Wrimo gngr has created a PHP progress bar that's free to use and easy as well. Perfect for showing off those growing wordcounts! Thanks gngr!

Need a word processor that takes all your attention? Go with Q10. This is a free word processor that blacks out the rest of the screen while you use it. If this doesn't help you complete that pesky first draft, few other things will. Remember to hit F1 to access your menu options. Recommended by Xmolder.

This generator gives you a plot and a word goal to reach, handy for NaNo warm-ups or just stretching your skills. Recommended by Fulk.

This site has generators for pretty much anything you need - names, plots, etc. Whether you're a writer or a gamer, this is a good site to check out. They also have several links to other generator sites.

A copy/paste word counter that tallies words, syllables, characters and offers a few options for analyzing your writing.

This word counter displays which words are being used the most - a good editing tool if you're worried you're being repetitive. Simply copy/paste a body of text in and pick your settings. This is a free service.

Novel writing software that several NaNoers have endorsed. This software comes with a bucket load of features specifically geared for writers. Better than your average word processor, this lets you work on your story scene by scene and much more. Recommended by that marvelous Fulk fellow.