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Gtk-Theming-Guide
Unlock your creativity and design your first GTK theme with this beginner's guide.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Pantheon is build/based on GTK. So, I believe that this will help you. Also, you can always visit gnome-look.org, download a theme and look through its files and see how it is made. You can also build a theme on top of it or use it as a template to get you started, ya know, open source and all those thangs. lol
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.