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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.
nvim-oxi, which uses bindings to the C functions used by the lua API. Note that it's currently broken for nvim nightly, but I'm working on a fix.
also since much new development is done in lua (such as core features like semantic highlighting, core plugins such as man.lua and filetype.lua, and just about every new neovim plugin out there, it's a lot easier to contribute to said development once you understand lua syntax, and learning how to configure neovim in lua naturally requires you to learn lua anyways for more advanced configs.
There is already https://github.com/teal-language/tl, which is typed Lua. I think fennel exists to serve a different niche-- personally I use it not for any type features; I just like the syntax better, and others may find certain features like the macro system useful.