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klassy
Klassy is a highly customizable binary Window Decoration, Application Style and Global Theme plugin for recent versions of the KDE Plasma desktop.
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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.
Breeze isn't affected because it's written as C++ code instead of just using images and a text config file, but the downside is that it's a lot more complicated to create a custom one (the only one I know of that still appears to see some development is Klassy, which is a fork of Breeze).
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.