Utility software

Archiver

7-Zip
The best compression tool out there.
7z format is best.

Browser

Chrome Browser
I use this browser as my surfing browser, it has excellent security features that making searching (and browsing) the internet a breeze. It's also great when you need to close your work browser and still need the supporting work.
I find this browser to be the most convenient in its class.
Extension
Grammarly

State of the art spell checker.

Markdown Viewer

View markdown (*.md) files in Chrome.

Microsoft Edge
I use this as my development browser, so I leave the JavaScript setting to on, and the cache clearing to "on browser close." Obviously this is not for surfing the open internet.
Edge comes installed with Windows.
Extension
Grammarly

State of the art spell checker.

Email client

Thunderbird
The best free email client out there.
IMAP

Word processor

LibreOffice
This document editor just keeps getting better with time.