nvim-tree/nvim-tree.lua is a mature Neovim file explorer plugin written entirely in Lua. It provides a tree-view sidebar with file system operations, git status indicators, diagnostic integration (LSP/COC), file filtering, bookmarks, clipboard management, and extensive customization. The architecture is modular, with clearly separated concerns: an explorer module handles tree construction and traversal; a view module manages the floating or split window; a renderer with a decorator pattern applies icons and highlights; a git module runs async git status queries; and an actions layer handles file create/rename/delete/trash. It uses an internal event system, filesystem watchers via libuv, and a public API for user extensions. The codebase demonstrates solid Lua craftsmanship, including a fluent node iterator, a classic OOP library, and a config validation recursive checker. It is actively maintained, with continuous adaptation to Neovim API changes and cross-platform support.