If for some reason you've to use the spyware OS Windows10 then why don't you at least use these great libre programs and games? Think of it as a first step towards more privacy on your desktop.
All mentioned software is open source and cross platform (works natively on Linux)
Media player
VLC
- Most feature rich video player
Clementine (music player)
- If you want an older style dense UI
Elisa (music player)
- if you want a more modern UI
PDF reader
Okular
- supports many formats, including PDF, EPub, DjVU and MD for documents; CBR and CBZ for comics; and many more.
- Supports annontations, text selection and more.
- Download from here
Office software
LibreOffice
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Best free office suite and a great alternative to Microsoft Office
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Compatible with a wide range of formats such as Microsoft
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Supports extensions
Browser
Firefox
- Check this post for why you should use Firefox and ditch any other browser.
Torrent
qBittorrent
- Polished User Interface, Well-integrated and extensible Search Engine, RSS support, Sequential downloading (to watch media while downloading)
Deluge
Screenshot
Flameshot
- Very light, easy to use with a customizable appearance, screenshot editing and uploading to Imgur
Imagie viewer
Nomacs
- Beautiful interface, supports most image formats, image editing and more
Archive Utility
PeaZip
Text editor
Kate
Password manager
KeepassXC
File explorer
Dolphin
- lightweight and feature rich, multiple tabs and split view features allow navigating multiple folders at the same time, access to cloud services and more
Artistic/Creator software
Blender
- 3D creation suite and a whole lot more
Krita
- Professional painting program with great features
GIMP
- Photoshop alternative
- Those used to Photoshop's interface should check PhotoGIMP out. It's a patch that makes GIMP look like Photoshop
Ardour
- digital audio workstation
KDENLive (video editor)
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use it for basic video editing or professional work, supports almost all audio and video formats
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Titler, many effects and transitions and a lot more
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Configurable themable interface and shortcuts that can also be configured
Audacity
- Great audio editor and recorder
Inkscape
- A vector graphics editor for drawing and making illustrations
CAD software
OpenSCAD
FreeCAD
Gaming
Minetest
- Minecraft alternative
Dolphin emulator
0AD
- Reak time strategy game of ancient warfare, got great graphics
Xonotic
- first-person shooter with multiplayer support
Veloren
- Multiplayer RPG
Game engines
Doom
- open source engines, not free assets unless you use freedoom
OpenRA
OpenMW
RetroArch
Godot
More linux software on windows
If you want to go further and try out some of the software that would come with many linux distributions out of the box with a desktop environment called KDE Plasma.
KDE Plasma is a desktop environment, which is basically the foundation of your computer's desktop, it controls taskbars and start menus, docks and panels, titlebars and close buttons, settings and configuations. The KDE desktop uses a toolkit that's cross compatible with windows, so it's possible for the devs to port their software over to windows (like krita, Okular and kdenlive).
While porting is still a somewhat large task thanks to how different windows is compared to linux, there's a pretty good library of windows binaries of KDE programs here. Since these programs are made for linux it's important to note that they won't be as good as they would be on linux, they probably won't be as stable either because they just don't have the same kind of freedom as they do on linux, but it's good for understanding some of the core software.
This post only presents a curated sample of available cross platform software so feel free to ask for more alternatives
Check this post for open source apps on Android
If you ever have a libre related question, come ask in !libre
https://stride3d.net/ Is a great free, open source video game engine written in C#.