Quarkdown is an open-source, Markdown-based typesetting system for creating papers, presentations, knowledge bases and static websites. It offers a complete authoring experience with a reactive preview and scripting capabilities, and version 2.4 allows Markdown elements to be extended.
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Quaver is a community-driven, open-source competitive rhythm game available on Steam. The site lists mapsets and scores and links to a wiki covering gameplay, editor, rules, skins, multiplayer and ranking. A v1.7 client update added features, improvements and bug fixes.
Quaver is a GitHub repository or organization with source code, releases, documentation, or project resources.
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.
Qubes Os is a code project with source, releases, documentation, or setup notes.
Research data portal for exploring engineering records, including dataset.
Searchable public dataset catalog maintained by Queensland Government.
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.
Search humanities and social data collections and supporting survey data from EEC.
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.
A reference page of links for searching cached copies and web archives. It advises opening all links in new tabs, noting this can slow down or suspend the browser, and suggests refreshing if archives fail to load. It also recommends searching for the site name with a site:public4.pagefreezer.com query or trying PageFreezer when no copy is found.
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.
QuickTiles is a code project with source, releases, documentation, or setup notes.
Quilt Mc is a GitHub repository or organization with source code, releases, documentation, or project resources.
QuizFlow is an open-source, ad-free Android app for creating and studying custom word lists with interactive flashcards and quizzes. It includes progress stats, text-to-speech pronunciation, import and export of lists, and works fully offline. The upstream source repository was archived, so no further updates are planned.
QUT Research Data Finder is QUT's discovery service for research data created or collected by QUT researchers. The application aggregates research metadata, specifically details around data collections, and offers advanced search plus browsing of research data sets, researchers and spatial data sets.
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.
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.
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.
RaceVPN is a VPN service offering free premium servers with WireGuard, V2Ray, OpenVPN and other protocols, without registration. It supports Windows, macOS, Linux, Android and iOS, and the free account is valid for a limited period such as three days. Users download a configuration file and import it into a VPN client.
RADAR, hosted at radar-service.eu, is a research data archive available in German and English. It enables users to search and filter the latest data publications by attributes including creators, publishers, production year, language, subject areas, resource type, license, rights holders, community, keywords, and ontologies. The platform also provides access to repository information including its privacy policy, terms and conditions, legal notices, and accessibility declaration.
Searchable repository for finding biology datasets and datasets.