Linux

I don't have a favorite system font, am I meant to? I did try to play with fonts at one point but the process of finding fonts and then figuring out how to install them was a bit much.

Ubuntu

I've been using Fantasque sans mono for a bunch of years now.

For desktop, I've liked Lato, Source Sans Pro, and Inter to name three.

For terminal, I used Iosevka's customizer to create a gorgeous Fira Mono-like variant that I call Iosevka Firesque:

[buildPlans.IosevkaFiresque]
family = "Iosevka Firesque"
spacing = "term"
serifs = "sans"
noCvSs = true
exportGlyphNames = false

  [buildPlans.IosevkaFiresque.variants]
  inherits = "ss05"

    [buildPlans.IosevkaFiresque.variants.design]
    capital-g = "toothless-corner-serifless-hooked"
    capital-q = "crossing-baseline"
    g = "single-storey-serifed"
    long-s = "bent-hook-tailed"
    cyrl-a = "single-storey-earless-corner-serifed"
    cyrl-ve = "standard-interrupted-serifless"
    cyrl-capital-ze = "unilateral-serifed"
    cyrl-ze = "unilateral-serifed"
    cyrl-capital-en = "top-left-bottom-right-serifed"
    cyrl-en = "top-left-bottom-right-serifed"
    cyrl-capital-er = "open-serifless"
    cyrl-er = "earless-corner-serifless"
    cyrl-capital-u = "cursive-flat-hook-serifless"
    cyrl-u = "curly-motion-serifed"
    cyrl-capital-e = "unilateral-bottom-serifed"
    cyrl-e = "unilateral-bottom-serifed"
    brace = "straight"
    ampersand = "upper-open"
    at = "threefold"
    cent = "open"

Fira Sans / FiraGO by Mozilla, and the new SUSE font by SUSE.

Fira Code and Caskaydia Cove Nerd Font for monospace. For other uses, I'm usually good with whatever the system ships with.

0xProto

I find comic sans mono actually looks surprisingly nice for coding and terminal.

Hack nerd font is my go to for terminal use.

Lato, League Spartan, League Gothic are my three most used fonts by a wide margin. Lato and its variety of weights for most things, League when I am doing design work and need a cleaner title or header.

Lately ive been weirdly taken with TT2020 Style G, which is an odd name for a no-name font that replicates an old imperfect typewriter. For whatever reason, switching my writing software to that (Manuscript) suddenly fired up my writing flow.

Fantasque

Iosevka

I don’t have a reason to move away from the Fedora defaults except for monospaced fonts.

Terminal wise, terminus is my default. It’s so clean, and it looks good without anti-aliasing.

Roboto Mono is my current preference for monospaced fonts.

Adobe Source Code Pro and JetBrains Mono are good alternatives as well.

Ubuntu Mono for terminal, code, and data, Open Sans for the rest

For sans-serif, I use Mona Sans. For monospace, I use Monaspace. I think it's a good-looking combination.

Since basically forever I use DejaVu Sans for UI elements and DejaVu Mono for the terminal.

Inter for desktop and the nerd-font variant of JetBrainMono for Terminal.

Iosevka.

Ubuntu font. Idk why but I like it.

I've been a fan of IBM Plex for a while now.

I use M+ Fonts for most of my stuff.

I've been enjoying Fira Sans and Fira Mono for far too long: https://mozilla.github.io/Fira/

Please don't hate me but for desktop I use Segoe UI. After years of using it everything else looks just kinda off and cheap to me. Similar to when folder icons are not yellow

I know that this will anger some people, but I just use the defaults and I don't get why there are so many fonts, since they don't seem that much different to me.

Anyone using Nimbus Sans?

It's actually preinstalled in a lot of systems. You can check via
gnome-font-viewer or find /usr/share/fonts -name "*Nimbus*"

Protomolecule for that scifi feel

I always end up with SF Pro Display for my desktop. For terminal I’m happy with several mentioned here.

For terminal/editor I went through CodingFont and ended up on Noto Sans Mono. Before that I used Source Code Pro for years. Both patched for nerd fonts, obviously.