Are you being forced to upgrade your office suite again to keep up with newer computers? LibreOffice has all you need and it’s free.
Moving from replacing items of regularly or less-used software to Open Source versions can be a big step. Switching operating system is entirely another.
If you want a photo editor with lots of power for your (no) money, then GIMP should definitely be on your shopping list.
Audacity sound editing and recording. If you’re not a professional that knows the name of the software you want, then this will have all you will ever need.
If you like reading old books and have a kindle (or tablet, phone or computer), there are nearly 50,000 free books to download at gutenberg.org.
If you fancy venturing into the world of desktop publishing, Scribus is a free, Open Source and powerful tool for preparing posters, newsletters and books.