Lua is used in many products and projects around the world. Here are some highlights. A different selection is shown every day.
Solar2D is a free Lua based game engine with focus on ease of iterations and usage. It is a fork of the well established and widely used Corona SDK game engine. | Snort, a popular network intrusion prevention and detection system, is scriptable with Lua. | GitHub uses Lua scripts in the infrastructure of GitHub Pages, its static site hosting service. | Neovim is a popular hyperextensible Vim-based text editor that supports Lua plugins. |
LÖVE is a free framework for making 2D games in Lua. | Wikipedia uses Lua as its template scripting language. Read the announcement. | Nmap, a popular tool for network discovery and security auditing, is scriptable with Lua. | The widely popular game Angry Birds is mostly written in Lua. See a talk by Jaakko Lisalo at the Game Design Expo 2011. |