Free and open-source Android software

Telegram is a cloud-based, cross-platform social media and instant messaging (IM) service. It launched for iOS on 14 August 2013 and Android on 20 October 2013. It allows users to exchange messages, share media and files, and hold private and group voice or video calls as well as public livestreams. It is available for Android, iOS, Windows, macOS, Linux, and web browsers. Telegram offers end-to-end encryption in voice and video calls, and optionally in private chats if both participants use a mobile device.

WordPress (WP, or WordPress.org) is a web content management system. It was originally created as a tool to publish blogs but has evolved to support publishing other web content, including more traditional websites, mailing lists, Internet forums, media galleries, membership sites, learning management systems, and online stores. Available as free and open-source software, WordPress is among the most popular content management systems – it was used by 22.52% of the top one million websites .

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

alt=Kiwix, running on an Android tablet|thumb|272x272px|Kiwix app, running on an Android tablet Kiwix is a free and open-source offline web browser created by Emmanuel Engelhart and Renaud Gaudin in 2007. It was first launched to enable offline access to Wikipedia, but has since expanded to include other projects from the Wikimedia Foundation, public domain texts from Project Gutenberg, many of the Stack Exchange sites, and many other resources. Available in more than 100 languages, Kiwix has been included in several high-profile projects, from smuggling operations in North Korea to Googl

privacy-focused encrypted messaging app

free and open-source cross-platform web browser

free and open-source, privacy-focused web browser developed by Brave Software, Inc. based on the Chromium web browser

open source middleware system for volunteer and grid computing

end-to-end encrypted e-mail service from Proton AG

open source chess engine

free software media player

F-Droid is a free and open source app store and software repository for Android, serving a similar function to the Google Play Store. The main repository, hosted by the project, contains only free and open source apps. Applications can be browsed, downloaded, and installed from the F-Droid website or client app without the need to register an account. "Anti-features" such as advertising, user tracking, or dependence on non-free software are flagged in app descriptions.

The Invisible Internet Project (I2P) is an anonymous network layer (implemented as a mix network) that allows for censorship-resistant, peer-to-peer communication. Anonymous connections are achieved by encrypting the user's traffic (by using end-to-end encryption), and sending it through a volunteer-run network of roughly 55,000 computers distributed around the world. Given the high number of possible paths the traffic can transit, a third party watching a full connection is unlikely. The software that implements this layer is called an "I2P router", and a computer running I2P is called an "I2

OpenTTD is a business simulation game in which players try to earn money by transporting passengers, minerals and goods via road, rail, water and air. It is an open-source remake and expansion of the 1995 Chris Sawyer video game Transport Tycoon Deluxe.

NetHack is an open source single-player roguelike video game, first released in 1987 and maintained by the NetHack DevTeam. The game is a fork of the 1984 game Hack, itself inspired by the 1980 game Rogue. The player takes the role of one of several pre-defined character classes to descend through multiple dungeon floors, fighting monsters and collecting treasure, to recover the "Amulet of Yendor" at the lowest floor and then escape.

GCompris is a software suite comprising educational entertainment software for children aged 2 to 10. GCompris was originally written in C and Python using the GTK+ widget toolkit, but a rewrite in C++ and QML using the Qt widget toolkit has been undertaken since early 2014. GCompris is free and open-source software and the current version is subject to the requirements of the AGPL-3.0-only license. It has been part of the GNU project.

Anki (, ; ) is a free and open-source flashcard program. It uses techniques from cognitive science such as active recall testing and spaced repetition to aid the user in memorization. The name comes from the Japanese word for "memorization" ().

GNU version of the Emacs text editor

Luanti (formerly Minetest) is a community-driven, free and open-source voxel game engine, available on various platforms. Originally, Luanti was a voxel game created in October 2010 by Perttu Ahola to explore the mechanics of Minecraft. Over time, Luanti evolved from the original Minetest game into a general game engine as developers integrated new features.

Freeciv is a single- and multiplayer turn-based strategy game for workstations and personal computers inspired by the proprietary ''Sid Meier's Civilization series. It is available for most desktop computer operating systems and available in an online browser version. Released under the GNU GPL-2.0-or-later, Freeciv'' is free and open-source software. The game's default settings are closest to Civilization II, in both gameplay and graphics, including the units and the isometric grid. However, with a lot of multiplayer games being played in longturn communities, rulesets and additional variants

content filtering and ad blocking browser extension

Jitsi (from , "wires") is a collection of free and open-source multiplatform voice (VoIP), video conferencing and instant messaging applications for the Web platform, Windows, Linux, macOS, iOS, iPadOS, watchOS, and Android. The Jitsi project began with the Jitsi Desktop (previously known as SIP Communicator). With the growth of WebRTC, the project team focus shifted to the Jitsi Videobridge for allowing web-based multi-party video calling. Later the team added Jitsi Meet, a full video conferencing application that includes web, Android, iOS, iPadOS, and watchOS clients. Jitsi also operates me

Firefox derivative recommending only free software

Script Creation Utility for Maniac Mansion Virtual Machine (ScummVM) is a set of game engine recreations. Originally designed to play LucasArts adventure games that use the SCUMM system, it also supports a variety of non-SCUMM games by companies like Revolution Software and Adventure Soft. It was originally written by Ludvig Strigeus. ScummVM is free software that is released under the terms of the GNU General Public License.

graphics software

multi-platform, free and open source media player

SageMath (previously Sage or SAGE, "System for Algebra and Geometry Experimentation") is a computer algebra system (CAS) with features covering many aspects of mathematics, including algebra, combinatorics, graph theory, group theory, differentiable manifolds, numerical analysis, number theory, calculus, and statistics.

Psiphon is a free and open-source Internet censorship circumvention tool that uses a combination of secure communication and obfuscation technologies, such as a VPN, SSH, and a Web proxy. Psiphon is a centrally managed and geographically diverse network of thousands of proxy servers, using a performance-oriented, single- and multi-hop routing architecture.

decentralized encrypted chat and collaboration software powered by the Matrix protocol

mobile web browser

Wikimedia list article

crowdsourced astronomy project

VPN service from Proton AG

OsmAnd (; OpenStreetMap Automated Navigation Directions) is a free and open-source map and navigation app for Android and iOS. It uses the OpenStreetMap (OSM) map database for its primary displays, but is an independent app not endorsed by the OpenStreetMap Foundation. It is available in both free and paid versions; the latter unlocks the download limit for offline maps and provides access to Wikipedia points of interest (POIs) and their descriptions from within the app. Map data can be stored on the device for offline use. Using the device's GPS capabilities, OsmAnd offers routing, with visua

FrostWire is a free and open-source BitTorrent client first released in September 2004, as a fork of LimeWire. It was initially very similar to LimeWire in appearance and functionality, but over time developers added more features, including support for the BitTorrent protocol. In version 5, support for the Gnutella network was dropped entirely, and FrostWire became a BitTorrent-only client.

free and open-source map navigation app, designed to function without internet connectivity

Nintendo GameCube and Wii emulation software

OpenArena is a free and open-source video game. It is a first-person shooter, and a fork of ioquake which in itself was a fork of Quake III Arena.

system maintenance OS for mobile devices

CoMaps is a community-driven, free and open-source, offline navigation app that uses map data from OpenStreetMap (OSM). The app is designed to function without internet connectivity by downloading maps for offline use. CoMaps emphasizes privacy, transparency, and community collaboration, aiming to provide a navigation solution that is not only easy to use, but also respects user data and fosters open participation.

PPSSPP (an acronym for "PlayStation Portable Simulator Suitable for Playing Portably") is a free and open-source PSP emulator for Windows, macOS, Linux, iOS, Android, Nintendo Wii U, Nintendo Switch, BlackBerry 10, MeeGo, Pandora, Xbox Series X/S and Symbian with a focus on speed and portability. It was released to the public on November 1, 2012, licensed under the GNU GPLv2 or later. The PPSSPP project was created by Henrik Rydgård, one of the co-founders of the Dolphin emulator.

distributed open multimedia communications platform

Termux is a free and open-source terminal emulator for Android which allows for running a Linux environment on an Android device. Termux installs a minimal base system automatically; additional packages are available using its package manager, based on Debian's.

Rockbox is a free and open-source software replacement for the OEM firmware in various forms of digital audio players (DAPs) with an original kernel. It offers an alternative to the player's operating system, in many cases without removing the original firmware, which provides a plug-in architecture for adding various enhancements and functions. Enhancements include personal digital assistant (PDA) functions, applications, utilities, and games. Rockbox can also retrofit video playback functions on players first released in mid-2000. Rockbox includes a voice-driven user-interface suitable for o

Maps.me is a mobile app for Android, iOS and BlackBerry that provides offline maps using OpenStreetMap data. It was formerly known as MapsWithMe. In November 2014, it was acquired by Mail.Ru Group and became part of its My.com brand. In September 2015, the app was open sourced and a free and open-source software version was additionally made available on F-droid until the application was sold to the payment processor Daegu Limited, part of Parity.com, which changed the application user interface and content, leading original MapsWithMe founders Alexander Borsuk and Viktor Govako to release an

modified YouTube version for Android

RetroArch is a free and open-source, cross-platform frontend for emulators, game engines, video games, media players and other applications. It is the reference implementation of the libretro API, designed to be fast, lightweight, portable and without dependencies. It is licensed under the GNU GPLv3.

2002 video game

Orbot is a free proxy app that provides anonymity on the Internet for users of the Android and iOS operating systems. It allows traffic from apps such as web browsers, email clients, map programs, and others to be routed via the Tor network.

instant messaging client

free desktop environment based on GTK+

E-Mail application for Android

cowsay is a program that generates ASCII art pictures of a cow with a message. It can also generate pictures using pre-made images of other animals, such as Tux the Penguin, the Linux mascot. It is written in Perl. There is also a related program called , with cows with thought bubbles rather than speech bubbles. .cow files for cowsay exist which are able to produce different variants of cows, with different kinds of eyes, and so forth. It is sometimes used on IRC, desktop screenshots, and in software documentation. It is more or less a joke within hacker culture, but has been around long enou

home automation software

roguelike video game, open source, first release version in 1990, community driven development up to now

TextSecure was an encrypted messaging application for Android that was developed from 2010 to 2015. It was a predecessor to Signal and the first application to use the Signal Protocol, which has since been implemented into WhatsApp and other applications. TextSecure used end-to-end encryption to secure the transmission of text messages, group messages, attachments and media messages to other TextSecure users.

Unix command to print a random message

TraceTogether was a digital system implemented by the Government of Singapore to facilitate contact tracing efforts in response to the COVID-19 pandemic in Singapore. The main goal was a quick identification of persons who may have come into close contact with anyone who has tested positive for COVID-19. The system helps in identifying contacts such as strangers encountered in public one would not otherwise be able to identify or remember. Together with SafeEntry, it allows the identification of specific locations where a spread between close contacts may occur.

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.