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Ferdium
Ferdium is a desktop app that helps you organize how you use your favourite apps by combining them into one application.
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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.
On the GitHub page (https://github.com/kofigumbs/multi) there's an example for tabs. I didn't use this since I want my sites separated, hopefully it does what you want. Search for that section with "fancier example". Tried pasting it here but it looks like ass.
Check out https://ferdium.org
NOTE:
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Hence, a higher number means a more popular project.