I've already written a whole post dedicated to this. My favorite is Tagxedo. There are lots of others out there too, depending on your preferences. This is not only a useful tool to figure out what words you are using most/overusing during editing, but it's also really really fun. And just imagine, you can make all kinds of cool gear to sell or give away or whatever out of these. Tagxedo has that option. Mugs, shirts, bags, whatever. It's fabulous.
I have a thing for websites where you can look up quotations of all kinds by all kinds of people on all kinds of subjects. I like it when I can find a particular concept or a wordage that speaks to me. It's inspirational. And on top of that, sometimes, using a quote in your novel (or many quotes) as additional material, chapter headings and such, is really cool. I did that for the entirety of the Chosen Four series. I may never do it again, but I liked it a lot. Also, if you're feeling artsy, you can use this website to make pictures out of quotations. (Or you could use Tagxedo again!)
This is a fun little website where you can enter your own writing to see which famous writer you write like. I like to do it for every single one of my books, because I almost invariably get a different author for each book. This is probably a good thing, because it means I have a unique voice. Either that or I'm just scattered and insane. Anyway, it's really interesting, but mostly fun. Check it out!
Some other fun stuff for writers includes writing communities, blogs by other writers and agent/editors, randomized naming tools, and lists of awesome words. There are also a lot of good writerly jokes out there, many of which center on NaNoWriMo, which hopefully we're all past the trauma of now.
Also, here's my big discovery for the week: the official term for the Katniss/Peeta ship is Everlark! How beautiful is that? Yes. I like it.
In other other news, my laptop died yesterday, taking half my music with it. I still have my books, though, and I have a new laptop now, which is very nice and snazzy.
Images via the linked websites.