https://www.pcmag.com/article/335730/the-best-free-software

QUOTE:   Desktop operating systems like Windows and macOS don’t get all the attention anymore. It’s a mobile world, but we have not fully abandoned the desktop. Software can be expensive if you’re not smart about it. Free programs have been a mainstay of the desktop experience for decades, and the offerings only get more powerful and fascinating. As PCs compete with smartphones, it gets even better. Software developers can adopt an ad-based model, donation-ware to keep things afloat, or a shareware/freemium model that charges for extra features.

Best 2019 Free Desktop Categories
Anti-Malware
Audio/Podcasts
Back-Up & Synchronization
Browsers
Clean-Up / Maintenance Utilities
Conferencing
Ebooks and Digital Comics
Email
File Recovery and Deletion
File Transfer
File Management
File Viewers and Converters
Graphics and Imaging
Maps
Media Players/Centers
Messaging
Networking
Notes
Office Suites and Presentations
Operating Systems (Linux, etc)
Remote Access and Screen Sharing
PDF Tools
Security/Privacy
Screen Capture/Record
Software Updaters
Uninstallers and Installers
Video Software
Virtual Machines
Windows Enhancers
Writing Tools