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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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kmacro-x.el
A collection of Emacs commands, modes and functions building on top of the keyboard macros (kmacros) system.
The original multiple cursors package is amazing for what it is, but it scales very badly. Emacs is efficient when editing at one place at a time (as you'd do normally), and when mc replicates all the edits character-by-character for all the cursors, it does the very opposite of this: many edits all in very different places. It works quite well when using just a few cursors, but going above a dozen of them causes them to be visibly sluggish.
https://github.com/vifon/kmacro-x.el (full disclosure: this one is my own)