Make sure quick booting is turned off in Windows. It can mess up a shared disk otherwise.

LocalSend if you want to send files between devices on your local network. Works on (almost) all operating systems.

VLC video player

Redshift or F.Lux to reduce blue light at night.

GPick to see exactly what color a pixel is.

GHex for editing binary files (advanced).

VLC for multimedia

Syncthing to sync files across devices, it's really handy

Firefox for browsing

OnlyOffice, it has a more modern interface than LibreOffice and better support of .***x files (docx, xlsx, pptx, ...)

Thunderbird for mail services

FileZilla if you've got a ftp server

KDE connect to easily sync your phone and your PC. You can do more than sync, you can control one from the other, etc. Give it a go. There is also a fork called Zorin Connect which might or might not be better suiter for Mint.

For additional softwares that may or may not be useful to you : Krita, GIMP, TexStudio, konsole, Blender, wine, steam, proton-GE.

disable fastboot in windows, that actually ruins the experience

Using backup lool for image disk as clonezilla/RescueZilla/foxclone just in case

I can't live without TOR Browser. Open a Terminal and follow these instructions on how to install:

https://itsfoss.gitlab.io/post/how-to-install-tor-browser-on-linux-mint-22-21-or-20/

Echoing VLC as a must-have as well.