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office-ribbonx-editor
An overhauled fork of the original Custom UI Editor for Microsoft Office, built with WPF
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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.
However, I've always just used this FOSS editor. It's a standalone editor, no need for admin rights, and best of all makes editing the file for the custom tab super easy along with verifying your xml is formatted correctly for the change.
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