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vim-illuminate
illuminate.vim - (Neo)Vim plugin for automatically highlighting other uses of the word under the cursor using either LSP, Tree-sitter, or regex matching.
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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.
There is also vim-illuminate if you don't have treesitter and uses LSP if it's possible to highlight from the language server.
If you have treesitter, you can use nvim-treesitter-refactor. It has the highlight_definitions option that will highlight the definitions of a variable.
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.