Software using the GNU Lesser General Public License

media player, streaming client, streaming media server, and audio and video converter (transcoder), free/libre and open-source cross-platform software

virtual online world

object-oriented framework for GUI creation

GTK (formerly GIMP ToolKit and GTK+) is a free open-source widget toolkit for creating graphical user interfaces (GUIs) targeted at Linux and specifically GNOME (though with some use in other desktop environments). It is licensed under the terms of the GNU LGPL, allowing both free and proprietary software to use it.

compatibility layer for running Windows software on Unix-like systems

7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. 7-Zip has its own archive format called 7z introduced in 2001, but can read and write several others.

OCaml ( , formerly Objective Caml) is a general-purpose, high-level, multi-paradigm programming language which extends the Caml dialect of ML with object-oriented features. OCaml was created in 1996 by Xavier Leroy, Jérôme Vouillon, Damien Doligez, Didier Rémy, Ascánder Suárez, and others.

thumb|right|Interior of 3D house thumb|right|Arduino board imported from Eagle PCB software

The GNU C Library, commonly known as glibc, is the GNU Project implementation of the C standard library. It provides a wrapper around the system calls of the Linux kernel and other kernels for application use. Despite its name, it now also directly supports C++ (and, indirectly, other programming languages). It was started in the 1980s by the Free Software Foundation (FSF) for the GNU operating system.

Processing is a free graphics library and integrated development environment (IDE) built for the electronic arts, new media art, and visual design communities with the purpose of teaching non-programmers the fundamentals of computer programming in a visual context.

thumb|Preferred badge for promoting apps on Flathub since 2023, English version Flatpak is a utility for software deployment and package management for Linux. It provides a sandbox environment in which users can run application software in (partial) isolation from the rest of the system. Flatpak was known as xdg-app until 2016.

Text editor

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FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams. At its core is the command-line ffmpeg tool itself, designed for processing video and audio files. It is widely used for format transcoding, basic editing (trimming and concatenation), video scaling, video post-production effects, and standards compliance (SMPTE, ITU).

programming language

Java ORM framework

free and open-source browser engine of the Chromium project

IceWM is a stacking window manager for the X Window System, originally written by Marko Maček. It was written from scratch in C++ and is released under the terms of the GNU Lesser General Public License.

right|thumb|150px|A screenshot illustrating block selection mode

graphics-related software library

MonoDevelop (also known as Xamarin Studio) is a discontinued open-source integrated development environment for Linux, macOS, and Windows. Its primary focus is development of projects that use Mono and .NET Framework. MonoDevelop integrates features similar to those of NetBeans and Microsoft Visual Studio, such as automatic code completion, source control, a graphical user interface (GUI), and Web designer. MonoDevelop integrates a Gtk# GUI designer called Stetic. It supports Boo, C, C++, C#, CIL, D, F#, Java, Oxygene, Vala, JavaScript, TypeScript, and Visual Basic.NET. Although there is no wo

Photo manager for GNOME

free software spell checker

PeaZip is a free and open-source file manager and file archiver for Microsoft Windows, ReactOS, Linux, MacOS and BSD by Giorgio Tani. It supports its native PEA archive format (supporting compression, multi-volume split, and flexible authenticated encryption and integrity check schemes) and other mainstream formats, with special focus on handling open formats. Version 9.4.0 supported 234 file extensions.

PulseAudio is a network-capable sound server program distributed via the freedesktop.org project. It runs mainly on Linux, including Windows Subsystem for Linux on Microsoft Windows and Termux on Android; various BSD distributions such as FreeBSD, OpenBSD, and macOS; as well as Illumos distributions and the Solaris operating system. It serves as a middleware in between applications and hardware and handles raw PCM audio streams.

GUI specification and toolkit for the X Window System

Fast Light Toolkit (FLTK) is a cross-platform widget (graphical control element) library for graphical user interfaces (GUIs), developed by Bill Spitzak and others. Made to accommodate 3D graphics programming, it has an interface to OpenGL, but it is also suitable for general GUI programming.

LanguageTool is a free and open-source grammar, style, and spell checker, and all its features are available for download. The LanguageTool website connects to a proprietary sister project called LanguageTool Premium (formerly LanguageTool Plus), which provides improved error detection for English and German, as well as easier revision of longer texts, following the open-core model.

MyBB, formerly MyBBoard and originally MyBulletinBoard, is a free and open-source forum software developed by the MyBB Group. It is written in PHP, supports MariaDB, MySQL, PostgreSQL and SQLite as database systems and, in addition, has database failover support. It is available in multiple languages and is licensed under the LGPL. The software allows users to facilitate community driven interaction through a MyBB instance.

SharpDevelop (also styled as #develop) is a discontinued free and open source integrated development environment (IDE) for the .NET Framework, Mono, Gtk# and Glade# platforms. It supports development in C#, Visual Basic .NET, Boo, F#, IronPython and IronRuby programming languages.

Bochs (pronounced "box") is a portable IA-32 and x86-64 IBM PC compatible emulator and debugger mostly written in C++ and distributed as free software under the GNU Lesser General Public License. It supports emulation of the processor(s) (including protected mode), memory, disks, display, Ethernet, BIOS and common hardware peripherals of PCs.

thumb|Simplified software architecture of GTK, [[Pango, GDK, ATK, GIO, Cairo and GLib.]] GLib is a bundle of three (formerly five) low-level system libraries written in C and developed mainly by GNOME. GLib's code was separated from GTK, so it can be used by software other than GNOME and has been developed in parallel ever since.

Scalable layer-1 blockchain developed by Telegram, now maintained by the open-source TON Core; designed for high-throughput smart contracts, decentralized applications, and seamless integration with Telegram

zero-configuration networking (zeroconf) implementation

Content management system, free and open-source wiki software

open-source content-management system

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open-source Microsoft Silverlight implementation

thumb|300x300px|An interactive proof session in CoqIDE, showing the proof script on the left and the proof state on the right.

ROOT is an object-oriented computer program and library developed by CERN. It was originally designed for particle physics data analysis and contains several features specific to the field, but it is also used in other applications such as astronomy and data mining. The latest minor release is 6.34, as of 2025-04-08.

Kexi is a visual database applications creator tool by KDE, designed to fill the gap between spreadsheets and database services requiring more sophisticated development. Kexi can be used for designing and implementing databases, data inserting and processing, and performing queries. It is developed within the Calligra project but is released separately.

programming language

free-software distributed data storage platform

library for arbitrary precision arithmetic, operating on signed integers, rational numbers and floating point numbers

OpenCms is an open-source content management system written in Java. It is distributed by Alkacon Software under the LGPL license. OpenCms requires a JSP Servlet container such as Apache Tomcat.

GROMACS is a molecular dynamics package mainly designed for simulations of proteins, lipids, and nucleic acids. It was originally developed in the Biophysical Chemistry department of University of Groningen, and is now maintained by contributors in universities and research centers worldwide. GROMACS is one of the fastest and most popular software packages available, and can run on central processing units (CPUs) and graphics processing units (GPUs). It is free, open-source software released under the GNU Lesser General Public License (LGPL) (GPL prior to Version 4.6).

TuxGuitar is a free and open-source tablature editor, which includes features such as tablature editing, score editing, and import and export of Guitar Pro gp3, gp4, and gp5 files. In addition, TuxGuitar's tablature and staff interfaces function as basic MIDI editors.

fast, small and free C compiler

gtkmm (formerly known as gtk-- or gtk minus minus) is the official C++ interface for the popular GUI library GTK. gtkmm is free software distributed under the GNU Lesser General Public License (LGPL).

JasperReports is an open source Java reporting tool that can write to a variety of targets, such as: screen, a printer, into PDF, HTML, Microsoft Excel, RTF, ODT, comma-separated values (CSV), XSL, or XML files.

libraries and software frameworks

XWiki is a free and open source wiki software platform written in Java with a design emphasis on extensibility. XWiki is an enterprise wiki. It includes WYSIWYG editing, OpenDocument-based document import/export, annotations and tagging, and advanced permissions management.

PHP-GTK is a set of language bindings for the programming language PHP which allow GTK graphical user interface (GUI) applications to be written in PHP. PHP-GTK provides an object-oriented programming interface to GTK classes and functions. PHP-GTK partly supports GTK2, but GTK3 is unsupported.

programmable Unicode-compliant smart-font technology and rendering system developed by SIL International as free software

250px|thumb|Autopackage installing software

Polkit (formerly PolicyKit) is a component for controlling system-wide privileges in Unix-like operating systems. It provides an organized way for non-privileged processes to communicate with privileged ones. Polkit allows a level of control of centralized system policy. It is developed and maintained by David Zeuthen from Red Hat and hosted by the freedesktop.org project. It is published as free software under the terms of version 2 of the GNU Lesser General Public License.

BZFlag (an abbreviation for Battle Zone capture the Flag) is an online multiplayer free and open-source tank game. In the game of BZFlag, players drive around tanks, viewed from a first-person view, in a server-defined world (also known as a "map"), which can be modified.

descriptive vector graphics language

cross-platform package manager

OpenNN (Open Neural Networks Library) is a software library written in the C++ programming language which implements neural networks, a main area of deep learning research. The library is open-source, licensed under the GNU Lesser General Public License.