I am still on Windows 7 on my home desktop (I’ll be building a new PC later this year) and 10 on my laptop and work. I like Classic Shell to get the familiar Start menu back.
Tools I use:
Box Sync for cloud storage – for documents that I might want to access both at home and at work, or want an online backup of which I can also access from my phone. I keep my recorded music here for both backup purposes and so I can listen at work the next day with fresh ears.
KeePass for password management. There might be better ones, but I recommend everybody use some kind of password manager so they can easily have a different password for every login. I keep the database in the cloud, but require a private key file that is only stored locally.
Simplenote for notes 
Bins to organize pinned apps in my taskbar. At home I have an ultrawide monitor and I keep the taskbar vertical.
Listary is how I tend to launch programs/find files that I don’t keep in the toolbar.
Greenshot for screenshots.
Agent Ransack for serious file searching within the computer… regex searches of file contents etc.
LIbreOffice (mostly for spreadsheets) so I don’t have to buy Office.
CCleaner for occasional disk cleanup and removing cruft from the Registry.
WizTree for mapping what’s consuming my disk space. More out of curiosity and a general desire to keep it tidy, than because I’m low on space.
Foxit Reader for PDFs because it’s a whole lot faster than Adobe.