Software using the GNU Affero General Public License

Arduino () is an Italian open-source hardware and software company (owned by Qualcomm), as well as a project and user community that designs and manufactures single-board microcontrollers and microcontroller kits for building digital and other kinds of devices. Its hardware products are licensed under a CC BY-SA license, while the software is licensed under the GNU Lesser General Public License (LGPL) or the GNU General Public License (GPL), permitting the manufacture of Arduino boards and software distribution by anyone. Arduino boards are available commercially from the official website or t

free and open-source federated social networking project

online project for book data by the Internet Archive

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.

Zotero () is a free and open-source reference management software to manage bibliographic data and related research materials, such as PDF and ePUB files. Features include web browser integration, online syncing, generation of in-text citations, footnotes, and bibliographies, integrated PDF, ePUB and HTML readers with annotation capabilities, and a note editor, as well as integration with the word processors Microsoft Word, LibreOffice Writer, OnlyOffice, and Google Docs. It was originally created at the Center for History and New Media at George Mason University and, as of 2021, is developed

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" ().

Odoo is a business management software suite developed in Belgium. It includes modules for customer relationship management, e-commerce, billing, accounting, manufacturing, warehouse operations, project management, and inventory management.

Single Sign-On and file hosting service by Canonical Group Limited

Elasticsearch is a source-available search engine developed by Elastic. It is based on Apache Lucene and provides a distributed, multitenant-capable full-text search engine with an HTTP web interface and schema-free JSON documents. Official clients are available in Java, C#, PHP, Python, Ruby, and other languages. According to the DB-Engines ranking, Elasticsearch is the most popular enterprise search engine.

software forge

Bitwarden is a freemium open-source password management service that is used to store sensitive information, such as website credentials, in an encrypted vault. It is owned and developed by Bitwarden, Inc.

Nextcloud is a suite of client-server software for creating and using file hosting services. It can integrate with the Collabora Online and OnlyOffice office suites. It can be hosted in the cloud or on premise and can scale up to millions of users. It has been translated into over 100 languages.

edX LLC is an American for-profit massive open online course provider. It was founded by MIT and Harvard. It is a subsidiary of 2U.

PeerTube is a free and open-source, decentralized, ActivityPub federated video platform. It can use peer-to-peer technology to reduce load on individual servers when videos get popular.

ownCloud is a free and open-source software project for content collaboration, file-sharing, and file-syncing. It's usable in distributed and federated enterprise scenarios.

The Persistence of Vision Ray Tracer, most commonly acronymed as POV-Ray, is a cross-platform ray-tracing program that generates images from a text-based scene description. It was originally based on DKBTrace, written by David Kirk Buck and Aaron A. Collins for Amiga computers. There are also influences from the earlier Polyray raytracer because of contributions from its author, Alexander Enzmann. POV-Ray is free and open-source software, with the source code available under the AGPL-3.0-or-later license.

Linux distribution for server virtualization

Ghostscript is a suite of software based on an interpreter for Adobe Systems' PostScript and Portable Document Format (PDF) page description languages. Its main purposes are the rasterization of documents in these languages, the display or printing of document pages, and conversion between PostScript and PDF files.

self-hosted link aggregator software and decentralised server network within the Fediverse

RStudio IDE (or RStudio) is an integrated development environment for R, a programming language for statistical computing and graphics. It's available in two formats: RStudio Desktop is a regular desktop application while RStudio Server runs on a remote server and allows accessing RStudio using a web browser. The RStudio IDE is a product of Posit PBC (formerly RStudio PBC, formerly RStudio Inc.).

decentralized encrypted chat and collaboration software powered by the Matrix protocol

Zabbix is an open-source monitoring platform for networks, servers, virtual machines, and cloud services. It collects metrics via SNMP, IPMI, JMX, and custom agents, then stores the data in a relational database and provides alerting, visualization, and reporting through a web-based frontend.

eyeOS was a web desktop for cloud computing, whose main purpose is to enable collaboration and communication among users. It is mainly written in PHP, XML, and JavaScript. It is a private-cloud application platform with a web-based desktop interface. eyeOS delivers a whole desktop from the cloud with file management, personal management information tools, and collaborative tools, with the integration of the client's applications.

PHP-Fusion is a free and open-source web framework based on PHP and MySQL & MariaDB that has an integrated content management system (CMS) among many other features.

Grafana is an open-source analytics and visualization web application. It connects to time series databases and other data sources, allowing users to build dashboards that display metrics, logs, and traces. Grafana supports data sources including Prometheus, Graphite, InfluxDB, Elasticsearch, PostgreSQL, and MySQL.

software library providing embedded database for key/value data

Pixelfed is a free and open-source image sharing social network service. The platform uses a decentralized architecture which is roughly comparable to e-mail providers, meaning user data is not stored on one central server. It uses the ActivityPub protocol, allowing users to interact with other social networks within the protocol, such as Mastodon, PeerTube, and Friendica. Pixelfed and other platforms utilizing this protocol are considered to be part of the Fediverse.

Neo4j is a graph database management system (GDBMS) developed by Neo4j Inc.

SugarCRM is a software company based in Silicon Valley. It produces the on-premises and cloud-based web application Sugar, a customer relationship management (CRM) system.

free and open source software microblogging server

GlobaLeaks is a free and open source software intended to enable secure and anonymous whistleblowing initiatives.

Friendica (formerly Friendika, originally Mistpark) is a free and open-source software distributed social network. It forms one part of the Fediverse, an interconnected and decentralized network of independently operated servers.

Mattermost is an open-source, self-hostable online chat service with file sharing, search, and third-party application integrations. It is designed as an internal chat for organisations and companies, and mostly markets itself as an open-source alternative to Slack and Microsoft Teams.

Bacula is an open-source, enterprise-level computer backup system for heterogeneous networks. It is designed to automate backup tasks that had often required intervention from a systems administrator or computer operator.

The Comprehensive Knowledge Archive Network (CKAN) is an open-source open data portal for the storage and distribution of open data. Initially inspired by the package management capabilities of Debian Linux, CKAN has developed into a powerful data catalogue system that is mainly used by public institutions seeking to share their data with the general public.

alt=Screenshot of the front page of FreedomBox|thumb|Front page of the FreedomBox user interface with most of the applications installed. FreedomBox is a free software home server operating system based on Debian, backed by the FreedomBox Foundation.

Kibana is a source-available data visualization dashboard for Elasticsearch, developed by Elastic NV. It is written in TypeScript and JavaScript and runs as a browser-based application backed by a Node.js server. Kibana lets users create bar, line, and scatter charts, pie charts, maps, and other visualizations against data stored in an Elasticsearch cluster, and arrange those visualizations into shared dashboards.

Searx (; stylized as searX) is a discontinued free and open-source metasearch engine, available under the GNU Affero General Public License version 3, with the aim of protecting the privacy of its users. To this end, Searx does not share users' IP addresses or search history with the search engines from which it gathers results. Tracking cookies served by the search engines are blocked, preventing user-profiling-based results modification. By default, Searx queries are submitted via HTTP POST, to prevent users' query keywords from appearing in webserver logs. Searx was inspired by the Seeks pr

thumb|Christian Grothoff, maintainer of GNUnet, in [[Berlin on August 1, 2013, at the "#youbroketheinternet. We'll make ourselves a GNU one." event]] GNUnet is a software framework for decentralized, peer-to-peer networking and an official GNU package. The framework offers link encryption, peer discovery, resource allocation, communication over many transports (such as TCP, UDP, HTTP, HTTPS, WLAN and Bluetooth) and various basic peer-to-peer algorithms for routing, multicast and network size estimation.

open-source PDF utility software

Loomio is decision-making software and web service designed to assist groups with collaborative, consensus-focused decision-making processes. It is a free software web application, where users can initiate discussions and put up proposals. As the discussions progress to initiating a proposal, the group receives feedback through an updatable pie chart or other data visualizations. Loomio is basically a web based forum (has optional email delivery interface) with tools to facilitate conversations and decision-making processes from starting and holding conversations to reaching outcome.

free and open-source federated social networking service

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.

GNU MediaGoblin (also shortened to MediaGoblin or GMG) is a free, decentralized Web platform (server software) for hosting and sharing many forms of digital media. It strives to provide an extensible, federated, and freedom-respectful software alternative to major media publishing services such as Flickr, DeviantArt, and YouTube.

RapidMiner is a data science platform that analyses the collective impact of an organization's data. It was acquired by Altair Engineering in September 2022, which was acquired by Siemens for about $10 billion in March 2025.

MakeHuman is a free and open source 3D computer graphics middleware designed for the prototyping of photorealistic humanoids. It is developed by a community of programmers, artists, and academics interested in 3D character modeling.

SecureDrop is a free software platform for secure communication between journalists and sources (whistleblowers). It was originally designed and developed by Aaron Swartz and Kevin Poulsen under the name DeadDrop. James Dolan also co-created the software.

CiviCRM ( C-R-M) is a web-based suite of internationalized open-source software for constituency relationship management that falls under the broad rubric of customer relationship management. It is specifically designed for the needs of non-profit, non-governmental, and advocacy groups, and serves as an association-management system.

spaced repetition software

ScyllaDB is a source-available distributed NoSQL wide-column data store. It was designed to be compatible with Apache Cassandra while achieving significantly higher throughputs and lower latencies. It supports the same protocols as Cassandra (CQL) and the same file formats (SSTable), but is a completely rewritten implementation, using the C++20 language replacing Cassandra's Java, and the Seastar asynchronous programming library replacing classic Linux programming techniques such as threads, shared memory and mapped files. In addition to implementing Cassandra's protocols, ScyllaDB also implem

iText is a library for creating and manipulating PDF files in Java and .NET. It was created in 2000 and written by Bruno Lowagie. The source code was initially distributed as open source under the Mozilla Public License or the GNU Library General Public License open source licenses. However, as of version 5.0.0 (released Dec 7, 2009) and version 4.2.0 (released Jul 10, 2015) it is distributed under the GNU Affero General Public License version 3. A fork of the LGPL/MPL licensed version of iText is currently being actively maintained as the OpenPDF library on GitHub. iText is also available thr

OpenBTS (Open Base Transceiver Station) is a software-based GSM access point, allowing standard GSM-compatible mobile phones to be used as SIP endpoints in Voice over IP (VoIP) networks. OpenBTS is open-source software developed and maintained by Range Networks. The public release of OpenBTS is notable for being the first free-software implementation of the lower three layers of the industry-standard GSM protocol stack. It is written in C++ and released as free software under the terms of version 3 of the GNU Affero General Public License.

MuPDF is a free and open-source software framework written in C that implements a PDF, XPS, and EPUB parsing and rendering engine. It is used primarily to render pages into bitmaps, but also provides support for other operations such as searching and listing the table of contents and hyperlinks.

OpenCog is a project that aims to build an open source artificial intelligence framework. OpenCog Prime is an architecture for robot and virtual embodied cognition that defines a set of interacting components designed to give rise to human-equivalent artificial general intelligence (AGI) as an emergent phenomenon of the whole system.

programming language

Nitter is a free and open source alternative frontend for Twitter, focusing on privacy and performance. Nitter is designed to allow access to Twitter without tracking, advertisements, or the need for an account. It only supports browsing, and cannot be used to sign in or interact with the Twitter community. Users can view user profiles, replies, media, and individual Tweets alongside their comments and Quote Tweets. Nitter also allows for searching by keywords, hashtags, usernames, locations, media and dates and supports the same formatting as Twitter's native advanced search function.

Overleaf is software for running a collaborative cloud-based LaTeX editor used for writing, editing and publishing scientific documents. More precisely, the term "Overleaf" may refer to the free-licensed software itself, to the main website running a proprietary version of the software, or to the organisation hosting the website running the proprietary software version.

Tor2web (pronounced "Tor to Web") is a software project to allow Tor hidden services to be accessed from a standard browser without being connected to the Tor network. It was created by Aaron Swartz and Virgil Griffith.

Genode is a novel OS architecture that aims to improve software safety by applying a strict organizational structure to all software components including device drivers, system services, and applications.

hMailServer was a free email server for Windows created by Martin Knafve. It ran as a Windows service and includes administration tools for management and backup. It had support for IMAP, POP3, and SMTP email protocols. It could use external database engines such as MySQL, MS SQL or PostgreSQL, or an internal MS SQL Compact Edition engine to store configuration and index data. The actual email messages were stored on disk in a raw MIME format. As of January 15th, 2022, active support and development were officially halted, although version 5.6 will continue to receive updates for critical bugs