This is a script that installs more than 40 popular Gnome themes (and that's not counting light/dark or compact variants), by downloading their latest code from Git. The themes are automatically built from source when needed, and are installed in the user's
~/.themes folder.To make it easy to install the "Install GNOME Themes" requirements, the project repository also includes two other scripts that automatically install the dependencies, for Fedora and Debian (this includes Ubuntu, etc.). Looking at the script repository, it seems the script supports not only Fedora and Debian / Ubuntu, but also Arch Linux (it does some Gtk version checks that are distro-specific). I only tried it on Ubuntu and Fedora though.
Themes installed by this script: Adapta, Adwaita Tweaks, Amber, Ant, Aqua, Arc (Firefox themes: Arc, Arc Darker, Arc Dark), Arc-Flatabulous, Arc-Red, Blue-Face, Breeze, Candra, Canta, Chrome-OS, Ciliora-Secunda, Ciliora-Tertia, Cloak, EvoPop, Fresh-Finesse, Greybird, macOS-Sierra, Materia (formerly Flat-Plat), Minwaita, Numix, Numix-Base16-Ocean, OSX-Arc-Darker, Paper, Plano, Plata, Pop, Pocillo, Qogir, Redmond-Themes (Windows 3.x, 95, 98, Vista and 8.1 themes), Typewriter, United GNOME, Unity7, Unity8, Vertex, Vimix, Xenlism-Minimalism, Yaru (formerly Communitheme) and Zuki.
Screenshots with a few of these themes:
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| Ant Gtk theme |