Software using the GNU General Public License

free software

FreeFileSync is a program used for file synchronization. It is available on Windows, Linux and macOS. The project is backed by donations. Donors get access to a Donation Edition that contains a few additional features such as an auto-updater, parallel sync, portable version, and silent installation. FreeFileSync has received positive reviews. FreeFileSync is available free of charge for personal use; the official Windows installer requires the users to accept the terms of use, which state that for business use they are required to purchase a business edition version of the application.

Filelight is a free graphical disk usage analyzer part of the KDE Gear set of applications. It shows directories that take up lots of space on the user's computer, and lets the user delete them. The app supports Windows and Unix-like systems and is open source.

routing software

free software tool

Ghemical is a computational chemistry software package written in C++ and released under the GNU General Public License. The program has graphical user interface based on GTK+2 and supports quantum mechanical and molecular mechanic models, with geometry optimization, molecular dynamics, and a large set of visualization tools. Ghemical relies on external code to provide the quantum-mechanical calculations — MOPAC provides the semi-empirical MNDO, MINDO, AM1, and PM3 methods, and MPQC methods based on Hartree–Fock calculations.

Ext2Fsd (short for Ext2 File System Driver) is a free Installable File System driver written in C for the Microsoft Windows operating system family. It facilitates read and write access to the ext2, ext3 and ext4 file systems.

uWSGI is an open source software application that "aims at developing a full stack for building hosting services". It is named after the Web Server Gateway Interface (WSGI), which was the first plugin supported by the project. uWSGI is maintained by the Italian-based software company unbit.

DVDStyler is a DVD authoring tool that supports creating video content for both DVDs and CDs, allowing users to burn the output to either DVD or CD media. It allows menu creation, buttons, and DVD previews. It is free and open source software under the GNU GPL.

TupiTube (previously KTooN and Tupi 2D) is a free and open-source 2D animation software developed and maintained by the Colombian startup, Mae Floresta. It is available for Windows, Mac OS X, Linux and Android under the terms of the GNU GPL-2.0 or later license.

electronic mailing list manager

Ocrad is an optical character recognition program and part of the GNU Project. It is free software licensed under the GNU GPL.

Greenfoot is an integrated development environment using Java or Stride designed primarily for educational purposes at the high school and undergraduate level. It allows easy development of two-dimensional graphical applications, such as simulations and interactive games.

txt2tags is a document generator software that uses a lightweight markup language. txt2tags is free software under GNU General Public License.

KisMAC is a wireless network discovery tool for Mac OS X. It has a wide range of features, similar to those of Kismet (its Linux/BSD namesake). The program is geared toward network security professionals, and is not as novice-friendly as similar applications. Distributed under the GNU General Public License, KisMAC is free software.

qmmp (for Qt-based MultiMedia Player) is a free and open-source cross-platform audio player that is similar to Winamp. It is written in C++ using the Qt widget toolkit for the user interface. It officially supports the operating systems Linux, FreeBSD and Microsoft Windows. In most Linux distributions, it is available through the standard package repositories. Until Audacious switched to Qt in version 4.0, qmmp was the only audio player to use Qt and not feature a database.

localization and translation toolkit

text editor

OneSwarm is a free and open-source file sharing software that uses the BitTorrent protocol to share files anonymously between users. One of the features is the ability to access the Dark Web.

CP2K is a freely available (GPL) quantum chemistry and solid state physics program package, written in Fortran 2008, to perform atomistic simulations of solid state, liquid, molecular, periodic, material, crystal, and biological systems. It provides a general framework for different methods: density functional theory (DFT) using a mixed Gaussian and plane waves approach (GPW) via LDA, GGA, MP2, or RPA levels of theory, classical pair and many-body potentials, semi-empirical (AM1, PM3, MNDO, MNDOd, PM6) and tight-binding Hamiltonians, as well as Quantum Mechanics/Molecular Mechanics (QM/MM) hyb

ClipGrab is a donationware video download manager, allowing downloads of videos from a variety of websites such as YouTube, Vimeo, Dailymotion, or Facebook. It has been praised for its user-friendliness, but also flagged as malware by security software. It can convert the downloaded files to other file formats such as MP3, MPEG4, OGG Theora or WMV. It is published as free software under the terms of the GPL-3.0-or-later license. It is developed and maintained by libre media labs GmbH.

LeoCAD is a free and open-source 3D CAD program for creating virtual Lego models by using parts from LDraw library. It was developed by Leonardo Zide in 1997.

TigerVNC is an open source Virtual Network Computing (VNC) server and client software, started as a fork of TightVNC in 2009. The client supports Windows, Linux and macOS. The server supports Linux. There is no server for macOS and as of release 1.11.0 the Windows server is no longer maintained.

software library for computing discrete Fourier transforms

ImpressPages is an open-source PHP framework with built-in content editor. Features include MVC engine, inline editing and drag&drop interface. It is distributed under the GNU GPL v.3.0 and MIT licences.

Linux.Wifatch is an open-source piece of malware which has been noted for not having been used for malicious actions, instead attempting to secure devices from other malware.

podcast aggregator

Lagarith is an open source lossless video codec written by Ben Greenwood. It is a fork of the code of HuffYUV and offers better compression at the cost of greatly reduced speed on uniprocessor systems. Lagarith was designed and written with a few aims in mind: Speed: While not as fast as HuffYUV, it still outperforms most other lossless video codecs when it comes to encoding times, although decoding speed may be slower. Recent versions also support parallelizing on multi-processor systems. Color-space support: Color-space conversions can cause rounding errors, introducing data loss, contrary t

Collection management software

Internet forum software

dvdisaster is a computer program aimed to enhance data survivability on optical discs by creating error detection and correction data, which is used for data recovery. dvdisaster works exclusively at the image level. This program can be used either to generate Error-Correcting Code (ECC) data from an existing media or to augment an ISO image with ECC data prior to being written onto a medium. dvdisaster is free software available under the GNU General Public License.

slrn is a console-based news client for multiple operating systems, developed by John E. Davis and others. It was originally developed in 1994 for Unix-like operating systems and VMS, and now also supports Microsoft Windows. It supports scoring rules to highlight, sort or kill articles based on information from their header. It is customizable, allows free key-bindings and can be extended using the S-Lang macro language. Offline reading is possible by using either slrnpull (included with slrn) or a local newsserver (like leafnode or INN). slrn is free software.

Tkabber is a GPL instant messaging client for the XMPP protocol which uses the Tk toolkit for the GUI. It runs on anything to which Tcl/Tk is ported: almost any X-based system (namely, any Linux and *BSD, Solaris, etc.), Microsoft Windows, and Mac OS X.

X2Go is open source remote desktop software for Linux that uses a modified NX 3 protocol. X2Go gives remote access to a Linux system's graphical user interface. It can also be used to access Windows systems through a proxy.

LinuxBoot is a free software project aimed at replacing most of the Driver Execution Environment (DXE) modules in Unified Extensible Firmware Interface (UEFI) firmware with the Linux kernel. LinuxBoot must run on top of hardware initialisation software in order to start. This can be the Pre-EFI Initialization (PEI) part of UEFI, coreboot, or U-Boot. It can boot Linux through the kexec syscall, but is also able to boot Windows with a different method.

NoteEdit is a defunct music scorewriter for Linux and other Unix-like computer operating systems. Its official successor is Canorus.

text editor that combines aspects of vi and Emacs

programming language and integrated development environment (IDE) for computer programming and learning

text-based file manager for Unix-like systems

Powerful text editor for MATE

Pylint is a static code analysis tool for the Python programming language. It is named following a common convention in Python of a "py" prefix, and a nod to the C programming lint program. It follows the style recommended by PEP 8, the Python style guide. It is similar to Pychecker and Pyflakes, but includes the following features: Checking the length of each line Checking that variable names are well-formed according to the project's coding standard Checking that declared interfaces are truly implemented.

iDempiere. Community Powered Enterprise, also known as OSGi + ADempiere, is an open source enterprise resource planning (ERP) software that is fully navigable on PCs, tablets and smartphones, it also has customer relationship management (CRM) and supply chain management (SCM) functions.

newsreader

Rawstudio is a free and open source stand-alone application software to read and manipulate images in raw image formats from digital cameras. It is designed for working rapidly with a large volume of images, whereas similar tools are designed to work with one image at a time.

digital audio editor and live playback tool

Free Range Routing or FRRouting or FRR is a network routing software suite running on Unix-like platforms, particularly Linux, Solaris, OpenBSD, FreeBSD and NetBSD. It was created as a fork from Quagga, which itself was a fork of GNU Zebra. FRRouting is distributed under the terms of the GNU General Public License v2 (GPL2).

tool for exchanging contents in an anonymous and secure way over a friend-to-friend (F2F) network

'LiVES (LiVES Editing System)' is a free and open-source video editing software and VJ tool, released under the GNU General Public License version 3 or later. There are binary versions available for most popular Linux distributions (including Debian, Ubuntu, Fedora, Suse, Gentoo, Slackware, Arch Linux, Mandriva and Mageia). There are also ports for BSD, and it will run under Solaris and IRIX. It has been compiled under OS X Leopard, but not thoroughly tested on that platform. In early 2019, a version for Microsoft Windows was announced, with a release slated for in the second half of 2019.

In computing, klibc is a minimalistic subset of the standard C library developed by H. Peter Anvin. It was developed mainly to be used during the Linux startup process, and it is part of the early user space, i.e. components used during kernel startup, but which do not run in kernel mode. These components do not have access to the standard library (usually glibc or musl) used by normal userspace programs.

HomeBank is a personal accounting software package that runs on BSD Unix, Linux, Windows, macOS (via MacPorts or Homebrew) and AmigaOS.

open source software used for creating Open Access repositories that are compliant with the Open Archives Initiative Protocol for Metadata Harvesting

programming language

eBPF is a technology that can run programs in a privileged context such as the operating system kernel. It is the successor to the Berkeley Packet Filter (BPF, with the "e" originally meaning "extended") filtering mechanism in Linux and is also used in non-networking parts of the Linux kernel.

UMLet is an open-source Java-based UML tool designed for teaching the Unified Modeling Language and for quickly creating UML diagrams. It is a drawing tool rather than a modelling tool as there is no underlying dictionary or directory of reusable design objects. UMLet is distributed under the GNU General Public License.

KDesktop is the component of the K Desktop Environment 3 and earlier, which provides a virtual background window to draw icons or other graphics on. In conjunction with Kicker and SuperKaramba, it constitutes the graphical shell.

DejaGnu is a software framework for testing other programs. It has a main script called runtest that goes through a directory looking at configuration files and then runs some tests with given criteria. The purpose of the DejaGnu package is to provide a single front end for all tests. It is a part of the GNU Project and is licensed under the GPL. It is based on Expect, which is in turn based on Tcl. The current maintainers are Rob Savoye and Ben Elliston.

thumb|Ibus anthy on gedit Anthy () is a package for an input method editor backend for Unix-like systems for the Japanese language. It can convert Hiragana to Kanji as per the language rules. As a preconversion stage, Latin characters (Romaji) can be used to input Hiragana. Anthy is commonly used with an input method framework such as ibus, fcitx or SCIM.

up2date, also known as the Red Hat Update Agent, is a tool used by older versions of Red Hat Enterprise Linux, CentOS and Fedora Core that downloads and installs new software and upgrades the operating system. It functions as a front-end to the RPM Package Manager and adds advanced features such as automatic dependency resolution. The file specifies where up2date will search for packages.

Open-Source content management system (CMS) developed by Magnolia International Ltd. Magnolia gives you composable digital experiences made for your real-world needs with hybrid headless CMS, easy integrations, and unified authoring.