I don’t normally recommend sites with an article but this one has a great deal of useable information and things that everyone needs.

Its called SPELL CHECK.NET, click here to view it , and it offers so much more than just a spell checker.
Also on the site, a thesaurus, a calculator, periodic tables, kitchen math converters, dictionaries, translators and a whole host of useful information for those of you who have kids and grand kids who are back to school again.

I don’t know who adminstrates the site and that information, so far as I could see, wasn’t there, but it’s remarkably useful and well done, and very easy to navigate from one thing to another.
This is one I”m going to bookmark to use more than once.