OS

• Linux on my laptop, had hackintoshed a 2015 MacBook Pro before to run macOS Sonoma, and that ran on this device before
• Windows on my desktop to play games from studios that are owned by a certain Chinese investment company starting on T.
• stock Android on my SM-A536B since LineageOS isn't ported (yet) to this device.

(Semi)Libre Software

• Zed
• Eternity for Lemmy
• Tubular (NewPipe + Sponsorblock and ReturnYTDislike)
• Tusky for Mastodon
• Rust (the language)

Proprietary software

• GSuite (for collaboration)
• Games and game launchers (namely Steam on PC and on laptop and Epic shitty games launcher on PC)

I'd consider my setup 8/10 FOSS.