Here is some linkage to sites I like and/or use a lot, roughly grouped into an oddball assortment of categories. Do check some of these sites out!
LibreOffice (Open-source office suite; successor to OpenOffice, which I used for over ten years before switching to LibreOffice. Can do most things that Microsoft Office can do, although not always quite as user-friendly.)
Scrivener (Yes, there’s a steep learning curve with this program and after using it for nearly a year I still have that “newbie fresh off the bus” feeling, but wow, this is a powerful program.)
Calibre (Essential program for indie writers, in my opinion. Coupled with Scrivener, it makes encoding your own e-books a breeze.)
Thesaurus.com (I don’t use this very often at all, but it does come in handy once in a while.)