Google glog is a library that implements application-level logging. This library provides logging APIs based on C++-style streams and various helper macros. You can log a message by simply streaming things to log at a particular severity level. It allows logging to be controlled from the command line.

Rsyslog offers high-performance, great security features and a modular design. While it started as a regular syslogd, rsyslog has evolved into a kind of swiss army knife of logging, being able to accept inputs from a wide variety of sources, transform them, and output the results to diverse destinations.

Plog is a C++ logging library that is designed to be simple, small and flexible. It is created as an alternative to existing large libraries and provides some unique features such as CSV log format and wide string support.

This package provides a bare-bones logging library for C++, with only a printf-like syntax and five logging levels.

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.

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

This Lua module offers an interface to the GNU readline library.

The function readline() is a wrapper, which invokes the GNU readline, adds the line to the end of the history list, and then returns the line. Usually you call save_history() before the program exits, so that the history list is saved to the histfile.

This Lua module can dialogue with the user on the controlling-terminal of the process (typically /dev/tty) as returned by ctermid(). It also support most of readline's alternative interface, namely handler_install, read_char and handler_remove, and readline's custom completion.

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.

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.

LuaSocket is a Lua extension library that is composed by two parts: a C core that provides support for the TCP and UDP transport layers, and a set of Lua modules that add support for functionality commonly needed by applications that deal with the Internet.

Among the supported modules, the most commonly used implement the SMTP (sending e-mails), HTTP (WWW access) and FTP (uploading and downloading files) client protocols. These provide a very natural and generic interface to the functionality defined by each protocol. In addition, you will find that the MIME (common encodings), URL (anything you could possible want to do with one) and LTN12 (filters, sinks, sources and pumps) modules can be very handy.

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 Lua module offers an interface to the GNU readline library.

The function readline() is a wrapper, which invokes the GNU readline, adds the line to the end of the history list, and then returns the line. Usually you call save_history() before the program exits, so that the history list is saved to the histfile.

This Lua module can dialogue with the user on the controlling-terminal of the process (typically /dev/tty) as returned by ctermid(). It also support most of readline's alternative interface, namely handler_install, read_char and handler_remove, and readline's custom completion.

LuaFileSystem is a Lua library developed to complement the set of functions related to file systems offered by the standard Lua distribution. LuaFileSystem offers a portable way to access the underlying directory structure and file attributes.

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.

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.

This Lua module offers an interface to the GNU readline library.

The function readline() is a wrapper, which invokes the GNU readline, adds the line to the end of the history list, and then returns the line. Usually you call save_history() before the program exits, so that the history list is saved to the histfile.

This Lua module can dialogue with the user on the controlling-terminal of the process (typically /dev/tty) as returned by ctermid(). It also support most of readline's alternative interface, namely handler_install, read_char and handler_remove, and readline's custom completion.

This is a binding to libunbound for Lua, allowing both asynchronous and DNSSEC-secured DNS lookups of arbitrary DNS record types.

It was created because Prosody needs an asynchronous DNS library with support for SRV records, and the ones found at the time did one or the other, or was missing DNSSEC that allowed implementing DANE.

It originated out of a need in the XMPP server software Prosody for an async-capable resolver library supporting SRV records, as well as a desire to experiment with DNSSEC and new DNS records.

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.

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.

LuaSQLite3 is a thin wrapper around the public domain SQLite3 database engine. It provides a complete binding to the SQLite3 C API from within Lua programs.

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.