Half-Life and Half-Life 2 have plenty of really good mods if you are interested in those, Black Mesa started as just a mod as well.
Some of my favourites for HL2:
- Entropy: Zero Two (on the same level of quality as Black mesa and its free on Steam)
- Nightmare House 2 (now named Nightmare House: The Original mod)
- Half Life 2: MMod
Some of my favourites for HL1:
- Half Life: Field Intensity
- Half Life: Delta Particles
- Half Life: MMod
There are many more that I haven’t mentioned / played myself.
Started with Gnome, then i3, Hyprland and now Sway. Gnome not being designed around customisability made me switch to i3. Hyprland has had some stability issues and regressions that annoyed me and so I switched to Sway. Thinking of trying out river at some point.