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7.css
A JS-independent, tree-shakeable CSS framework for building faithful recreations of the Windows 7 UI.
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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.
Mozilla SeaMonkey still has the HTML editor (and has been updated within a year!)
If you want to test it out, make sure you install https://github.com/gorhill/uBlock-for-firefox-legacy/release... from there, because it won't show up in the extensions search.
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.