GTK3: Changing the overlay/momentium scroll bar - Development Discussion - Ubuntu MATE Community
Mate Menu support (GTK3) · Issue #730 · numixproject/numix-gtk-theme · GitHub
adw-gtk3 - /s/Mate
Human GTK3 - TraditionalHumanized Themes - /s/Mate
Debian packages for mate-desktop with gtk3 and custom panel theme(now with Wayland support) : Luke : Free Download, Borrow, and Streaming : Internet Archive
Fixing packages for broken Gtk3 | There and back again
Mint-XP (GTK3, GTK2 & metacity pack) - /s/Mate
How to Install the GTK3 Version of MATE on Arch Linux - Make Tech Easier
GTK3/4 Themes - /s/Mate
MATE 1.10 Desktop Environment Arrives with Better GTK3 Support