Lua Grammar
This grammar for the Lua language is, as far as I can tell, completely 100% correct, up to Lua 5.4.4.
It parses the entire Lua codebase for the World of Warcraft Interface, https://github.com/tomrus88/BlizzardInterfaceCode which is 1373 source files comprising 460 thousand lines of code. It also parses all of the Lua code in the neovim repository, something like 200 thousand lines of code. Also the entire codebases of luvit and lit...
You may use this grammar freely in your own projects, though it would be nice if you acknowledged your use and provided a link to the CongoCC project.