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Qubes is a security-oriented, free and open-source operating system for personal computers. It uses the Xen hypervisor to compartmentalize a digital life, and it can run more than one Linux or Windows operating system. Integrated Whonix allows anonymous Internet use over the Tor network.
QuestDB is an open-source time-series database engineered for low latency. It uses a column-oriented, time-partitioned storage engine with memory-mapped files and vectorized execution for high-throughput ingestion and millisecond-level analytical queries. SQL is extended with time-series operators such as SAMPLE BY, LATEST ON, ASOF JOIN, WINDOW JOIN and HORIZON JOIN.
qui is a web UI for qBittorrent. It manages one or many qBittorrent instances from a single page, with cross-seed, rule-based automations, scheduled backups with restore, orphan scanning and a reverse proxy endpoint. It runs as a single binary or Docker image on Linux, macOS and Windows, using SQLite by default or Postgres. It is free and open source under GPL-2.0-or-later.
QuickRef.ME shares quick reference and cheat sheet material for developers, contributed by open source contributors. It covers topics including programming languages, Linux commands, Python, databases, keyboard shortcuts and other toolkits.
Quicksilver is a free, open-source macOS productivity application that enables users to launch apps, open files, and perform file and system actions via keyboard input. It offers hundreds of plugins to extend functionality, learns user habits to prioritize relevant actions, supports custom keyboard shortcuts and mouse gestures, and provides multiple customizable interface styles. The project is actively maintained by a community of developers.
QuoDB is a user-submitted database of movie and television quotes, described as the largest collection of time-based contextualized lines from film and series content contributed by users worldwide. The project's source code is licensed under Apache License v2.0, its documentation under CC BY 3.0, and its glyphicons under CC BY 3.0. The site includes a privacy policy, cookie policy, privacy settings, a cookie usage notice, and an option for users to request that their data not be shared with third parties.
qView is a free and open-source image viewer for Windows, macOS and Linux designed for minimalism and practicality. It supports common image formats including bmp, gif, jpg, png, tiff and webp, and offers animated GIF controls, file history, rotation and mirroring, and multithreaded preloading. It is based on Qt5 and released under the GPLv3 license.
Qwen is a GitHub organization presenting Alibaba Cloud's general-purpose AI models, with 60 repositories. Public projects include Qwen3.8, a large language model series, Qwen3-VL, a multimodal large language model series, and qwen-code, an open-source AI coding agent that lives in a terminal.
Qwen Studio is the official platform from Qwen that provides unified access to the company's series of open-source and proprietary AI models. It offers functionality including chatbots, image and video understanding, image generation and editing, document processing, tool utilization, voice and video chat, and artifacts, and has a dedicated mobile application.
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The R. L. Kurucz atomic linelist is hosted among databases maintained at the CfA. The source describes it as data from Kurucz CD-ROM 18 and 23, with links to CD-ROM 23, the CfA AMP Server and CD-ROM 18. Other Kurucz data are maintained separately by R. L. Kurucz.
R.ID provides third-party AMD GPU drivers described as a new way of multi-driver optimization with close-to-official implementation. It lists driver packages for Terascale, Legacy GCN, and Polaris-Vega-Navi architectures, available via Sourceforge, and notes that most common bugs found in official drivers have been fixed in the R.ID drivers.
r/notebooklm points to a Reddit community or thread with discussion, updates, troubleshooting, or shared resources.
R1Delta is an open source custom server framework for Titanfall 1 that allows hosting dedicated servers and loading mods. It is not affiliated with, endorsed by, or connected to Respawn Entertainment, Electronic Arts, or their subsidiaries.
Radio Nations is a free online radio directory that indexes live radio stations from multiple countries, searchable by country or genre. Stations play in the browser without an account or app. The site does not host audio and links directly to each station's source, so stream quality depends on the originating station. Stations that go offline are removed until the stream is restored.
RadioReference is a public reference source for radio and communications data. It provides a database of identified frequencies and trunked radio systems that can be browsed by state, metro area or ZIP code, alongside forums and a wiki. The site reports 226K+ identified frequencies and 7,400+ trunked radio systems. A premium subscription works across RadioReference and Broadcastify.
Radix UI provides components, icons and colors for building accessible user interfaces, described as free and open-source. Radix Themes is a pre-styled component library intended to work out of the box with minimal configuration, installed via the @radix-ui/themes package. Unstyled components are offered separately as Radix Primitives.
Rainmeter is a desktop customization tool that displays customizable skins on the desktop, including hardware usage meters and audio visualizers. It has been open source software distributed free of charge under the GNU GPL v2 license since February 2001. Rainmeter comes with a few simple starter skins, and users can create and modify their own skins in a simple language.
RankFi is a crypto media or research source for news, analysis, and blockchain market updates.
Open-source tracker monitoring ransomware leak sites and publishing structured status data.
Open source GPU accelerated data science libraries.
Rare is an open source alternative for Epic Games Launcher that uses Legendary. It is a graphical interface for Legendary, a command line alternative to the Epic Games launcher, written in PySide6. It runs natively and supports most major platforms.
Rarebit is a free, open-source webcomic template built in HTML and vanilla JavaScript. It uses a single HTML page for all comic pages and offers toggleable navigation, per-page titles and author's notes, and an automatically updating archive. It supports splitting one comic page into multiple image files. The template requires no extensions and little coding experience.
A self-hosted tool that searches many free book and audiobook sources at once, merges results into one ranked list, downloads files to the user's server and names and shelves each book. It is free and open source, and version 1.0 is a dockerised port of the former website.
