These are Windows based ,since Windows is my "default" OS
AutoHotKey [ this is by far the best productivity enhancement tool ever ] It basically allow you to script your environment.
ConEmu - proper terminal emulator for Windows. I'm using it with powershell set as default.
Total Commander - the best file manager out there. With some nice plugins. (commercial) . Free good alternatives are FARManager and Double Commander
Paint.NET free, features packed image editor.
Beyond Compare this is the best file comparation tool you can find (commercial)
VistaSwitcher proper Alt + Tab.
VirtuaWin fast, feature-full window desktop manager.
CLCL Clipboard caching utility. Multiple copy/paste. Yummmmy.
Pidgin for all my IM needs.
SMPlayer the best, most versatile video player around. Try MPV for a command line version.
MouseEmulator - it's a little better than the built in Windows solution.
Winsplit Revolution - move windows with the keyboard (not updated anymore but still the best free solution).
Shotty - best free screenshot app out there
Sublime Text , VIM (cli version) and Visual Studio Code are my (interchangeable) text editors.
bug.n - THE tiling window manager for Windows.
Thunderbird - my favorite email client. Also install Nostalgy.
Firefox is still the best, most customizable browser around.
Foobar2000 as music player.