Note that these are not all FOSS.
- 
Photo Editing: - GIMP
- Krita
- Paint.NET
 
- 
Video Editing: - DaVinci Resolve
- CapCut
- Shotcut
 
- 
Audio Editing: - Audacity
- Cakewalk
- GarageBand
 
- 
3D Graphics: - Blender
- Spline
- Rumba
 
- 
Office Software: - LibreOffice
- Microsoft 365 Free Apps
- WPS Office
 
- 
Antivirus Software: - Windows Security
- Avast Free Antivirus
- Malwarebytes
 
- 
Productivity Tools: - Bitwarden
- VSCodium
- PDF-XChange Editor
- 7-Zip
- OBS Studio
- LanguageTool
 



I like Krita. But to be honest, after years and years of using GIMP, I ironically have nothing but trouble trying to rewire my brain to do things any other way. The same problem that many people have when moving from Photoshop to GIMP.
Also, i fundamentally need DDS files, which Krita (AFAIK) doesn’t handle.
You should totally get on some PS forums and start bitching about its UI being ‘backward and unusable’ compared to GIMP :)