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material-decoration
Material-ish window decoration theme for KWin, with LIM, based on zzag's original design.
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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.
Zren's Material decoration has an option to hide it, Breeze windows decoration doesn't.
Klassy (by /u/paul4er) is a another great alternative with more configurability, but I'm not sure if it has that option.
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.