Currently running majority FLOSS, and glad for the excellent options that these very capable people have released.
Desktops, laptops, HTPC:
Trisquel GNU/Linux on Libreboot BIOS hardware
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Phones and tablets are:
GrapheneOS + Fdroid only apps
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Rockbox audio players
(+ Open Tunes from FMA, Argofox, CC netlabels, jamendo, bandcamp etc)
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Gadgetbridge + Amazfit Bip (watch)
[Looking to switch out this watch for a FLOSS smartwatch like: pinetime or bangle.js]
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and dd-wrt on the router