Software using the GNU General Public License

file archiver and data compression utility

aRts (which stands for analog real time synthesizer) is an audio framework that is no longer under development. It was best known for previously being used in K Desktop Environment 2 and 3 to simulate an analog synthesizer.

Jellyfin is a free and open-source media server and suite of multimedia applications designed to organize, manage, and share digital media files to networked devices. Jellyfin consists of a server application installed on a machine running Linux, Microsoft Windows, or macOS; and another application running on a client device such as a smartphone, tablet, smart TV, streaming media player, game console or in a web browser. Jellyfin also can serve media to DLNA and Chromecast-enabled devices. It is a fork of Emby.

ShareX is a free and open-source screenshot and screencast software for Windows. It is published under the GNU General Public License. The project's source code is hosted on GitHub. It is also available on the Microsoft Store and Steam.

An IRCd, short for Internet Relay Chat daemon, is server software that implements the IRC protocol, enabling people to talk to each other via the Internet (exchanging textual messages in real time). It is distinct from an IRC bot that connects outbound to an IRC channel.

dietlibc is a C standard library subset released under the GNU General Public License Version 2, and proprietary licenses are also available. It was developed with the help of about 100 volunteers by Felix von Leitner with the goal to compile and link programs to the smallest possible size. dietlibc was developed from scratch and thus only implements the most important and commonly used functions. It is mainly used in embedded devices.

electronic payment system

Claroline is an open-source collaborative eLearning and eWorking platform, (learning management system) operating under the GPL open-source license. It enables organizations to develop and manage courses and collaboration spaces online. Used extensively in educational institutions and by enterprises for data sharing, it boasts availability in around 100 countries and supports 35 languages

browser add-on to block nonfree nontrivial JavaScript

free open source RRDtool

Aptana, Inc. is a company that makes web application development tools for use with a variety of programming languages (such as JavaScript, Ruby, PHP, and Python). Aptana's main products include Aptana Studio, Aptana Cloud, and Aptana Jaxer.

CamStudio is an open-source screencasting program for Microsoft Windows released as free software. The software renders videos in an AVI format. It can also convert these AVIs into Flash Video format, embedded in SWF files. CamStudio is written in C++, but CamStudio 3 will be developed in C#. The program has distributed malware and harmful viruses via the installer.

AUCTeX is an extensible package for writing and formatting TeX files in Emacs and XEmacs.

ProFTPD (short for Pro FTP daemon) is an FTP server. ProFTPD is Free and open-source software, compatible with Unix-like systems and Microsoft Windows (via Cygwin). Along with vsftpd and Pure-FTPd, ProFTPD is among the most popular FTP servers in Unix-like environments today. Compared to those, which focus e.g. on simplicity, speed or security, ProFTPD's primary design goal is to be a highly feature rich FTP server, exposing a large amount of configuration options to the user.

Remmina is a free and open source remote desktop client for POSIX-based computer operating systems. It supports the Remote Desktop Protocol (RDP), VNC, NX, XDMCP, SPICE, X2Go and SSH protocols and uses FreeRDP as foundation.

Molecular builder/editor for Windows, Linux, and Mac OS X

former free software entity

2004 video game

MKVToolNix is a collection of tools for the Matroska media container format by Moritz Bunkus including mkvmerge. The free and open source Matroska libraries and tools are available for various platforms including Linux and BSD distributions, macOS and Microsoft Windows. The tools can be also downloaded from video software distributors and FOSS repositories.

GTK-based desktop wiki software written in Python

PlantUML is an open-source tool allowing users to create diagrams from a plain text language. Besides various UML diagrams, PlantUML has support for various other software development related formats (such as Archimate, Block diagram, BPMN, C4, Computer network diagram, ERD, Gantt chart, Mind map, and WBD), as well as visualisation of JSON and YAML files.

thumb|A screenshot of Mindustry gameplay in single-player campaign mode on Serpulo Mindustry is a free and open-source real-time strategy, factory management, and tower defense game developed and published by Anuken under the GNU General Public License v3. It is available for Windows, macOS, Linux, Android and iOS, where it can be downloaded for free from its author. It can also be bought on Steam and the App Store. As an open-source game, players can mod the game and its client without restriction, and it has no advertisements or in-app purchases; development is supported by donations.

macOS compatibility layer for GNU/Linux

Microsoft open source operating system

Darcs is a distributed version control system created by David Roundy. Key features include the ability to choose which changes to accept from other repositories, interaction with either other local (on-disk) repositories or remote repositories via SSH, HTTP, or email, and an unusually interactive interface. The developers also emphasize the use of advanced software tools for verifying correctness: the expressive type system of the functional programming language Haskell enforces some properties, and randomized testing via QuickCheck verifies many others. The name is a recursive acronym for Da

KMyMoney is a cross-platform double-entry bookkeeping system for personal finance management built on KDE technologies. Its operation is similar to Microsoft Money and Quicken. It supports different account types, categorization of expenses and incomes, reconciliation of bank accounts and import/export to the “QIF” file format. Through plugins, direct download using the OFX and HBCI formats is also possible. CSV imports and exports are also possible via plugins. KMyMoney is free software.

ejabberd is an Extensible Messaging and Presence Protocol (XMPP) application server and an MQ Telemetry Transport (MQTT) broker, written mainly in the Erlang programming language. It can run under several Unix-like operating systems such as macOS, Linux, FreeBSD, NetBSD, OpenBSD and OpenSolaris. Additionally, ejabberd can run under Microsoft Windows. The name ejabberd stands for Erlang Jabber Daemon (Jabber being a former name for XMPP) and is written in lowercase only, as is common for daemon software.

encrypted private messenger

console audio player

systemless root software for Android

RasMol is a computer program written for molecular graphics visualization intended and used mainly to depict and explore biological macromolecule structures, such as those found in the Protein Data Bank (PDB).

KGpg is a graphical frontend to GnuPG for KDE, which includes a key management window and an editor. Users can create cryptographic keys, and write, encrypt, decrypt, sign, or verify messages. When integrated with the Konqueror browser/file manager, users can encrypt files by right-clicking and choosing Actions > Encrypt File. Left-clicking on an encrypted file in Konqueror will prompt the user for a password to decrypt the file. The user can make public or private keys, and can export/import keys. A user can sign the keys, and set an expiration date.

ERPNext is a free and open-source integrated enterprise resource planning (ERP) software developed by an Indian software company Frappe Technologies Pvt. Ltd. It is built on the MariaDB database system using Frappe, a Python based server-side framework.

Linux IP Firewalling Chains, normally called ipchains, is free software to control the packet filter or firewall capabilities in the 2.2 series of Linux kernels. It superseded ipfirewall (managed by ipfwadm command), but was replaced by iptables in the 2.4 series. Unlike iptables, ipchains is stateless.

free and open-source web-based electronic portfolio management system

BleachBit is a free and open-source disk space cleaner, privacy manager, and computer system optimizer. The BleachBit source code is licensed under the GNU General Public License version 3.

fre:ac is a free audio converter and CD extractor for Windows, Linux, macOS, and FreeBSD, distributed under the GPL-2.0-or-later.

IRC client

GLPI (acronym: , or "Free IT Equipment Manager" in English) is an open source IT Asset Management, issue tracking system and service desk system. This software is written in PHP and distributed as open-source software under the GNU General Public License.

time-sharing operating system developed by MIT

EPrints is a free and open-source software package for building open access repositories that are compliant with the Open Archives Initiative Protocol for Metadata Harvesting (OAI-PMH). It shares many of the features commonly seen in document management systems, but is primarily used for institutional repositories and scientific journals. EPrints has been developed at the University of Southampton School of Electronics and Computer Science and released under the GPL-3.0-or-later license.

computer program

recordMyDesktop is a free and open source desktop screencasting software application written for Linux.

window manager for Linux and other Unix

PDFtk (short for PDF Toolkit) is a toolkit for manipulating Portable Document Format (PDF) documents. It runs on Linux, Windows and macOS. It comes in three versions: PDFtk Server (open-source command-line tool), PDFtk Free (freeware) and PDFtk Pro (proprietary paid). It is able to concatenate, shuffle, split and rotate PDF files. It can also show and update metadata. Both CLI and GUI versions of PDFtk are available.

disk partitioning application

mtPaint (short for '''Mark Tyler's Painting Program''') is a free and open-source raster graphics editor for creating icons, pixel art and for photo editing. It is available for Microsoft Windows and Linux operating systems.

Linux process scheduler

C.a.R. (Compass and Ruler), also known as Z.u.L. (), is a free and open source interactive geometry app that can do geometrical constructions in Euclidean and non-Euclidean geometry. The software is Java based. The author is René Grothmann of the Catholic University of Eichstätt-Ingolstadt. It is licensed under the terms of the GNU General Public License (GPL).

db4o (database for objects) was an embeddable open-source object database for Java and .NET developers. It was developed, commercially licensed and supported by Actian. In October 2014, Actian declined to continue to actively pursue and promote the commercial db4o product offering for new customers.

Akismet is a service that filters spam from comments, trackbacks, and contact form messages. The filter operates by combining information about spam captured on all participating sites and then using those spam rules to block future spam. Akismet is offered by Automattic, the company behind WordPress.com. Akismet was launched on October 25, 2005.

UltraVNC (sometimes written uVNC) is an open-source remote-administration/remote-desktop-software utility.

open source drum machine software

GPU-based terminal emulator

Pootle is an online translation management tool with a translation interface. It is written in the Python programming language using the Django framework and is free software originally developed and released by Translate.org.za in 2004. It was further developed as part of the WordForge project and the African Network for Localisation and is now maintained by Translate.org.za.

DeaDBeeF is an audio player software available for Windows, Linux and other Unix-like operating systems. An ad-supported Android version is available, but has not been updated since 2017. DeaDBeeF is free and open-source software, except on Android.

TeXShop is a free LaTeX and TeX editor and previewer for macOS. It is licensed under the GNU GPL.

application launcher for Linux

open source file compression software

CMSimple is a free content management system. It aims to be simple, small and fast. As it is written in PHP it runs on Linux/Apache servers, or on Win32 with Apache or IIS. CMSimple is licensed under the terms of the GPL3.