This week at the SFF 7, we're asking what is the website you use the most while writing?
I'm going to answer this a bit contrarily. While writing - that is, while drafting - I don't use any websites at all. I do my best to stay entirely offline while drafting. Anything I feel I might need to look up, I put in square brackets and save for the revision stage. On my most recently completed book, TWISTED MAGIC, I had nearly 200 square brackets when I stopped drafting and started revising, which was at about 75% through.
(Sometimes I draft all the way to the end, then revise; with other books I stop at some point and go back to the beginning, revise from there, then go to the end. There's no rhyme or reason to it. Each book is different. But that's another topic.)
Now, when I'm revising the website I use the most is... Plain Ol'Google.
(What a world we live in now, where I can write down Google search as an old-fashioned method.)
Now, my Google-fu is strong. I use [word] + etymology a lot to find better words for what I'm trying to say, or that word in another language. I look up specifics on things I want to research more. I look up names. I stay away from rabbit holes, even while revising.
For me, the internet is anti-writing, so I steer clear. Maybe that's true for you?