explainshell.com: A web-based tool to match command-line arguments to their man pages and help text.
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liberapay.com: A recurrent donations platform, formerly known as gittip and gratipay.
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Open Event Server: Enable event organizers to manage events from meetups to concerts to conferences, with support for multiple tracks and venues. Used by [FOSSASIA](https://fossasia.org/) and [eventyay](https://eventyay.com/).
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detect-secrets: An enterprise-friendly CLI for auditing, detecting, and preventing secrets in code.
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pre-commit: A framework for managing and maintaining multi-language git hooks.
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Stargate DAW: All-in-one Digital Audio Workstation (DAW) with a suite of instrument and effect plugins.
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Moa Bridge: A service to cross post [Mastodon](https://github.com/mastodon/mastodon) toots to Twitter and Instagram.
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Grafana OnCall: Developer-friendly incident response with brilliant Slack integration, with a PagerDuty migration path.
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Docker Compose: Docker Compose is a tool for defining and running multi-container Docker applications.
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SpaceSiren: Honeypot management and alert system for AWS tokens, with a fully serverless architecture.
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CourtListener: Web application which provides a graph-based search interface and API with 900,000 minutes of oral argument recordings, more than eight thousand judges, and more than three million opinions. Also powers [RECAP search](https://www.courtlistener.com/recap/).
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Algojammer: An experimental, proof-of-concept IDE to assist with algorithm-writing in a competition setting.
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Script Server: Turn scripts into interactive, validated, authenticated, auditable web UIs, without modifying the scripts.
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doc2dash: Extensible CLI-based [Documentation Set](https://developer.apple.com/library/archive/documentation/DeveloperTools/Conceptual/Documentation_Sets/010-Overview_of_Documentation_Sets/docset_overview.html#//apple_ref/doc/uid/TP40005266-CH13-SW6) generator intended for use with [Dash.app](https://kapeli.com/dash/) and [other](https://velocity.silverlakesoftware.com/) [compatible](https://github.com/dash-docs-el/helm-dash) [API browsers](https://zealdocs.org/).
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Nuxeo Drive: Cross-platform desktop synchronization client for the Nuxeo platform.
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Docassemble: Platform for creating mobile-friendly web-based interviews, collecting responses, and much more.
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SweetTooth Web: The web store for extensions to the [GNOME](https://en.wikipedia.org/wiki/GNOME) desktop environment, supporting adding and updating extensions directly from the browser.
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privacyIDEA: A multi factor authentication server running on premises, supporting many different token types and allowing authentication via REST API, RADIUS, PAM, Windows Credential Provider, SAML, OpenID Connect.
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NFO Viewer: A simple viewer for NFO files and the ASCII art therein, with preset fonts, encodings, automatic window sizing, and clickable hyperlinks.
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BYOB (Build Your Own Botnet): Client-server framework (RAT and C2 server) for security researchers to build and operate basic botnets.
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GRR Rapid Response: Server-agent system focused on remote live forensics for quick, browser-based triage and analysis of attacks on fleets of machines, with agent support for Linux, Windows, and OS X.
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RedNotebook: Desktop journal designed for rich text, media, and template-based entries, which can be tagged and searched, as well as exported to plain text, HTML, Latex, or PDF.
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Cataclysm: Dark Days Ahead (Launcher): Launcher for popular FOSS game [CDDA](https://cataclysmdda.org/), which supports automatic updates and mod management.
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Infection Monkey: Web-based tool for testing a datacenter's resiliency to perimeter breaches and internal server infection.
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distro-tracker: Web application designed to follow the evolution of a Debian-based distribution with email updates and a comprehensive web interface. Powers the [Debian Package Tracker](https://tracker.debian.org/).
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Music Player: A simple music player designed around an infinite intelligent playlist, with support for headless playback.
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SoundGrain: Graphical interface designed for drawing and editing trajectories to control [granular sound synthesis](https://en.wikipedia.org/wiki/Granular_synthesis).
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Diffoscope: Web-based deep comparison of files, archives, and directories, including support for diffing tarballs, ISO images, and PDFs.
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LocalStack: Self-hostable version of many AWS services, including S3, Route53, Lambda, Redshift, and much more, designed for testing cloud-centric code.
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Quru Image Server: High-performance web server for creating and delivering dynamic images.
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PPCI: The Pure Python Compiler Infrastructure is a compiler written entirely in Python, containing front-ends for various programming languages (C, c3, WebAssembly, and others) as well as machine code generation backends for various CPUs (6500, arm, avr, x86_64, openrisc, among others).
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ScratchABit: Easily retargetable and hackable interactive disassembler with IDAPython-compatible plugin API.
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readthedocs.org: Continuous integration platform for building and hosting documentation.
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Baby Buddy: Mobile-friendly web application which helps caregivers track sleep, feedings, diaper changes, and tummy time to learn about and predict baby's needs without (as much) guesswork.
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King Phisher: Server-based [phishing](https://en.wikipedia.org/wiki/Phishing) campaign toolkit, used to simulate real-world phishing attacks, with GTK-powered client application.
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ihatemoney: Web application made to ease shared budget management by keeping track of who bought what, when, and for whom.
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Open Streaming Platform: Self-hosted video streaming and recording server, designed as an alternative to Twitch and YouTube.
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Collaborate: Web-based collaboration tool designed by [Propublica](https://www.propublica.org/nerds/making-collaborative-data-projects-easier-our-new-tool-collaborate-is-here) for newsrooms to share datasets, with a workflow built around assigning tips and maintaining contacts.
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Calibre-Web: Web application providing a clean interface for browsing, reading, and downloading ebooks using an existing [Calibre](https://calibre-ebook.com/) database.
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nsupdate.info: Featureful dynamic DNS service, using the Dynamic DNS UPDATE protocol ([RFC 2136](https://tools.ietf.org/html/rfc2136)) to update BIND and other major nameservers.
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Indico: Feature-rich web application designed at [CERN](https://en.wikipedia.org/wiki/CERN) for managing events, with support for conference organization workflow, from content management to receiving and reviewing abstracts/papers, event registration, payment integration, room booking, and more.
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Prosopopee: A static site generator designed for photographers and others who tell stories with pictures.
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Socialhome: Web application enabling users to build a federated personal profile with social networking functionality.
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Headphones: Web-based digital music library for automating music downloads through Usenet and torrents.
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LazyLibrarian: Web-based digital library organizer with support for following authors and automatic metadata retrieval.
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CouchPotato: Personal video recorder focused on movies, with support for usenet and torrents.
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syncserver: All-in-one package for running a self-hosted Mozilla Firefox Sync server.
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archivematica: Digital preservation system designed to maintain standards-based, long-term access to collections of digital objects, targeted at archivists and librarians.
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dvc (Data Version Control): Command-line tool for version control over data used in machine learning projects. Aims to replace Excel and other tools used to track and deploy model versions.
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cartoonify / Draw This.: Turn a photograph into a toddler's drawing. Automatically!
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ArchiveBox: Self-hosted web archive, for creating local, browsable backups of content from the web. Imports HTML, JS, PDFs, video, subtitles, git repositories, and more, from Pocket, Pinboard, browser history, etc.
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Spiderfoot: Reconnaissance tool that automatically queries over 100 public data sources to gather intelligence on IP addresses, domain names, e-mail addresses, names, and more.
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SecureDrop: Whistleblower submission system for media organizations to securely accept documents from anonymous sources. Originally created by [Aaron Swartz](https://en.wikipedia.org/wiki/Aaron_Swartz) and currently managed by the [Freedom of the Press Foundation](https://en.wikipedia.org/wiki/Freedom_of_the_Press_Foundation).
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OnionShare: Secure and anonymous file sharing over [Tor](https://en.wikipedia.org/wiki/Tor_(anonymity_network)) services.
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speedtest-cli: Command-line interface for testing Internet bandwidth using [speedtest.net](https://speedtest.net).
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OpenSnitch: GNU/Linux port of the [Little Snitch](https://en.wikipedia.org/wiki/Little_Snitch) application firewall.
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Universal Radio Hacker (URH): Wireless protocol investigator, with a focus on analyzing proprietary IoT communication.
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PathPicker: Shell utility to interactively select paths from the output of other commands.
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CKAN: Data management system (DMS) which makes it easy to publish, share, and use data. Data hubs powered by CKAN include [datahub.io](https://datahub.io), [catalog.data.gov](https://catalog.data.gov), and [europeandataportal.eu](https://europeandataportal.eu/data/en/dataset), among many other sites.
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streamlink: Command-line utility that extracts streams from various services and pipes them into a video player of choice.
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BorgBackup: Deduplicating backup system with optional encryption and other features.
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Magic Wormhole: Security- and speed-focused file transfer tool with support for files, text, and directories.
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SOFA Statistics: User-friendly statistics and analysis with a learn-as-you-go approach.
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Abilian SBE: A "Social Business Engine" with features including lightweight document management, discussions, wikis, timelines, and more.
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RedHat Anaconda: Installation program used by Fedora, Red Hat Enterprise Linux, and other Linux distributions.
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TortoiseHg: Windows shell extension and a series of applications for the Mercurial distributed revision control system. Also includes GNOME and CLI support.
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CherryTree: Hierarchical wiki-like personal notepad, featuring rich text and syntax highlighting.
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InVesalius: Generates virtual reconstructions of structures in the human body for medical purposes, including CT and MRI scans.
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Home Assistant: Home automation platform that puts local control and privacy first.
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youtube-dl: Command-line program to browserlessly archive video and audio from YouTube and hundreds of other sites.
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Roundup Issue Tracker: Highly-customizable issue tracking system featuring command-line, web, and email interfaces, historically used by the official Python bug tracker at [bugs.python.org](https://bugs.python.org).
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Rietveld: Django-based collaborative code review tool for Subversion written by [Guido van Rossum](https://en.wikipedia.org/wiki/Guido_van_Rossum) to run on [Google AppEngine](https://en.wikipedia.org/wiki/Google_App_Engine). The basis for [Gerrit](https://en.wikipedia.org/wiki/Gerrit_(software)).
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Salt Stack: Automation for the management and configuration of any infrastructure or application at scale.
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StackStorm: Rules- and event-driven operational automation for auto-remediation, security responses, troubleshooting, deployments, and more.
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Jupyter Notebook: Web-based, extensible notebook environment for interactive computing.
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Komodo Edit: Multi-language code editor, written in JS, Python, and C++, based on the Mozilla platform.
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Leo Editor: Personal Information Manager (PIM), IDE, and outliner with a holistic approach to programming and writing.
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Spyder IDE: Scientific editing and execution environment designed by and for scientists, engineers, and data analysts using Python.
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Solaris IPS: Software delivery system backed by network repository, featuring safe execution for zones, use of ZFS for efficiency and rollback, preventing the introduction of invalid packages, and efficient use of bandwidth.
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Bandersnatch: PyPI mirror client complying with [PEP 381](http://www.python.org/dev/peps/pep-0381/).
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Ergonomica: Cross-platform shell language based on [S-expressions](https://en.wikipedia.org/wiki/S-expression) combined with traditional shell features.
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Robot Framework: Generic, cross-platform, and language-independent automation framework for acceptance testing, acceptance test driven development (ATDD), and robotic process automation (RPA). Extensible in Python and Java.
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Frescobaldi: An editor for [LilyPond](https://en.wikipedia.org/wiki/LilyPond) music files.
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GNU Solfege: An ear-training program intended to help musicians improve their skills.
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MusicBrainz Picard: Automatically identify, tag, and organize music albums and other digital audio recordings.
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Frets on Fire X: Highly customizable rhythm game supporting many modes of guitar, bass, drum, and vocal gameplay for up to four players.
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Unknown Horizons: 2D real-time strategy simulation with an emphasis on economy and city building. (Not unlike Age of Empires)
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OpenLibrary: Web application for an open, editable library catalog, used by [The Internet Archive](https://archive.org/) towards building a web page for every book ever published.
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Bitmessage: Reference client for Bitmessage, a peer-to-peer encrypted decentralised communication protocol.
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GlobaLeaks: Web application to enable secure and anonymous whistleblowing initiatives.
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Open edX Platform: Platform for online education providers, powering [edX](https://en.wikipedia.org/wiki/EdX).
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CellProfiler: Interactive data exploration, analysis, and classification of biological image sets.
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Django-CMS: Enterprise content management system based on the Django framework with version control, multi-site support, and more.
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