There are actually a looot of interesting word processors out there for free. I’ve tried most of them because I’m not a fan of the typical MS Word style. Too many features I don’t use so it takes up too much Memory. Like yWriter, which is designed by a writer for writers. It lets you plan and organize scenes and keep character lists in the writing file and much more. Downside was it cluttered the folder it was in, which was what made me ultimately stop using it.
There are a lot of distraction-free processors (Designed to write full screen without panels/menus visible) , from simple no-bells-and-whistle ones, to slightly more complex. My favourite of these is FocusWriter, because it has a spellcheck and wordcount, and it allows you to customise the background so I can write on any picture I stick in it, from blue birds to half naked men to, I don’t know, Grumpy cat. These kinds of writers you’ll wanna pair with something like Libreoffice or WPS writer for formatting/editing.
But when it comes to ones like MS word, I agree with the others, Libreoffice is excellent. I like it much better than OpenOffice even if they are from the same vein. If you want something lighter with similar features, WPS writer is an excellent lightweight alternative, and Google docs is great. I use google exclusively for collab work, but I prefer to work offline for my solos with Focus/Libre combo (since I’m on Linux and WPS doesn’t work well on mint, sadly.)
An unusual one I haven’t mentioned is Jarte. Some people looove it, some people hate it. It’s certainly different. Have fun with your return to writing! Trying new processors is fun. I envy you!