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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.
Shameless plug: my own implementation of Solarized, resolarized.nvim, supports undercurl. In fact, undercurl support was present from day one, I just could not see it until now.
The recently released Alacritty version 0.11.0 now supports coloured undercurl text decoration. This allows the undercurl to have a different colour than the text, and the colour can indicate the kind of "problem" (e.g. purple for typo, yellow for diagnostic warnings, red for diagnostic errors, etc.).
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.