Lunatik is a framework for scripting the Linux kernel with Lua
Tools for BPF-based Linux IO analysis, networking, monitoring, etc.
A lightweight online game framework
A vi-like editor based on Plan 9's structural regular expressions
BizHawk is a multi-system emulator written in C#
3D game engine/framework in C, with Luajit and Python bindings now
Lua based interactive firmware for ESP8266, ESP8285 and ESP32
Capstone disassembly/disassembler framework
Unicorn CPU emulator framework (ARM, AArch64, M68K, Mips, Sparc
Developer Assistant for PUC-Rio Tecgraf sci/tech toolkits on GNU/Linux
Powerful embedded Lua Engine for IoT devices, with many components
An Apache module for developing web applications using Lua