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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.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
Try this: https://github.com/gTile/gTile
Herbstluftwm (https://herbstluftwm.org/) has two ways to achieve what you want. And it plays nice with XFCE (and probably KDE) so you don't have to give up a traditional DE to use it.
This Gnome extension has some of what you want, but no stacking and no specifying positions for certain programs.
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.