QLogo is an interpreter for the Logo language written in C++ using Qt and OpenGL. Specifically, it mimics, as reasonably as possible, the UCBLogo interpreter.

The Lout document formatting system reads a high-level description of a document similar in style to LaTeX and produces a PostScript or plain text output file.

Lout offers an unprecedented range of advanced features, including optimal paragraph and page breaking, automatic hyphenation, PostScript EPS file inclusion and generation, equation formatting, tables, diagrams, rotation and scaling, sorted indexes, bibliographic databases, running headers and odd-even pages, automatic cross referencing, multilingual documents including hyphenation (most European languages are supported), formatting of computer programs, and much more, all ready to use. Furthermore, Lout is easily extended with definitions which are very much easier to write than troff of TeX macros because Lout is a high-level, purely functional language, the outcome of an eight-year research project that went back to the beginning.

Lsof stands for LiSt Open Files, and it does just that. It lists information about files that are open by the processes running on the system.

The luaossl extension module for Lua provides comprehensive, low-level bindings to the OpenSSL library, including support for certificate and key management, key generation, signature verification, and deep bindings to the distinguished name, alternative name, and X.509v3 extension interfaces. It also binds OpenSSL's bignum, message digest, HMAC, cipher, and CSPRNG interfaces.

LuaExpat is a SAX XML parser based on the Expat library.

LuaRocks is the package manager for the Lua programming language.

It allows you to install Lua modules as self-contained packages called rocks, which also contain version dependency information. This information can be used both during installation, so that when one rock is requested all rocks it depends on are installed as well, and also optionally at run time, so that when a module is required, the correct version is loaded. LuaRocks supports both local and remote repositories, and multiple local rocks trees.

This package provides Lua LRU cache based on the LuaJIT FFI.

LPeg is a pattern-matching library for Lua, based on Parsing Expression Grammars (PEGs).

This library makes libuv available to Lua scripts.

This package provides a FFI-based Lua API for ngx_http_lua_module or ngx_stream_lua_module.

This library makes libuv available to Lua scripts.

Fennel is a programming language that brings together the speed, simplicity, and reach of Lua with the flexibility of a Lisp syntax and macro system.

LuaSec is a binding for OpenSSL library to provide TLS/SSL communication. It takes an already established TCP connection and creates a secure session between the peers.

LPeg is a pattern-matching library for Lua, based on Parsing Expression Grammars (PEGs).

Lutok is a lightweight C++ API library for Lua.

Lutok provides thin C++ wrappers around the Lua C API to ease the interaction between C++ and Lua. These wrappers make intensive use of RAII to prevent resource leakage, expose C++-friendly data types, report errors by means of exceptions and ensure that the Lua stack is always left untouched in the face of errors. The library also provides a small subset of miscellaneous utility functions built on top of the wrappers.

Lutok focuses on providing a clean and safe C++ interface; the drawback is that it is not suitable for performance-critical environments. In order to implement error-safe C++ wrappers on top of a Lua C binary library, Lutok adds several layers or abstraction and error checking that go against the original spirit of the Lua C API and thus degrade performance.

Penlight is a set of pure Lua libraries focusing on input data handling (such as reading configuration files), functional programming (such as map, reduce, placeholder expressions,etc), and OS path management. Much of the functionality is inspired by the Python standard libraries.

The cqueues extension module for Lua implements an event loop that operates through the yielding and resumption of coroutines. It is designed to be non-intrusive, composable, and embeddable within existing applications.

This package provides a way to turn Lua code into Fennel code. This compiler does the opposite of what the Fennel compiler does.

Lua is a powerful, fast, lightweight, embeddable scripting language. Lua combines simple procedural syntax with powerful data description constructs based on associative arrays and extensible semantics. Lua is dynamically typed, runs by interpreting bytecode for a register-based virtual machine, and has automatic memory management with incremental garbage collection, making it ideal for configuration, scripting, and rapid prototyping.

The cqueues extension module for Lua implements an event loop that operates through the yielding and resumption of coroutines. It is designed to be non-intrusive, composable, and embeddable within existing applications.

This library makes libuv available to Lua scripts.

LuaJIT is a Just-In-Time Compiler (JIT) for the Lua programming language. Lua is a powerful, dynamic and light-weight programming language. It may be embedded or used as a general-purpose, stand-alone language.

LuaSec is a binding for OpenSSL library to provide TLS/SSL communication. It takes an already established TCP connection and creates a secure session between the peers.

LGI is gobject-introspection based dynamic Lua binding to GObject based libraries. It allows using GObject-based libraries directly from Lua. Notable examples are GTK+, GStreamer and Webkit.