JavaScript Quiz offers interactive quizzes and practice challenges for testing JavaScript knowledge. It presents 10 random questions, and after a question is answered a button appears for reading the explanation.
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Jayden's IPAs is a Telegram link for updates, app posts, files, or community notices.
Jellyfin allows users to customize the appearance of the web interface by applying custom CSS. The documentation states that custom CSS is only applied to clients that use Jellyfin Web and that support is not provided for issues caused by custom CSS.
Jitsi is a free open-source video conferencing software for web and mobile. It supports making calls, launching on one's own servers, and integrating into apps. The project states that meetings on meet.jit.si are limited to 95 minutes starting October 9, 2026.
Telegram link is a Telegram link for updates, app posts, files, or community notices.
Telegram link is a Telegram link for updates, app posts, files, or community notices.
Telegram link is a Telegram link for updates, app posts, files, or community notices.
Telegram link is a Telegram link for updates, app posts, files, or community notices.
Telegram link is a Telegram link for updates, app posts, files, or community notices.
Joomla! is a free and open source content management system used to build, organize, manage and publish content for websites, blogs, intranets and mobile applications. The site lists benefits including search engine friendly and mobile friendly output, multilingual support, unlimited design, multi-user permission levels and extensibility, along with thousands of free extensions and templates.
Joplin is a free, open-source note-taking and to-do application that organises notes into notebooks. Notes are stored in Markdown and are searchable, taggable and editable, with offline-first access, end-to-end encryption, plugins and themes, and sync via services including Nextcloud, Dropbox, OneDrive and Joplin Cloud. Apps exist for Windows, Linux, macOS, Android and iOS, plus a Firefox and Chrome web clipper.
JOPSS is a search system for papers originating from JAEA. It covers research areas including HTGR hydrogen and heat application, advanced nuclear systems, nuclear science and technology, computational science, nuclear nonproliferation and security, and Fukushima Daiichi accident research. It links to JAEA reports and publication lists.
Joystick Gremlin is a program for configuring joystick-like devices from any manufacturer or custom devices recognized by Windows. It uses vJoy virtual joysticks to map physical inputs to virtual ones and applies transformations such as response curves to analog axes. It also offers macros, a mode system and Python scripting.
JoyToKey is a shareware utility that lets PC game controllers emulate keyboard and mouse input, so Windows applications and web games can be controlled with joysticks. Users can create profiles and assign keyboard or mouse actions to joystick buttons. It is available as a free download, with a license key available for purchase.
JS Kid Pix helps discover apps, SaaS products, no-signup tools, clones, or software alternatives.
Edit subtitles with an open source desktop application.
JumpShare is an AI-powered screen recording and sharing application for macOS and Windows. It supports screen, webcam, or combined recording with audio, includes video editing tools, and allows users to share recorded content. Additional features include screenshot and GIF capture, video analytics, and custom video player branding.
Jumpstick is a guide for discovering interesting websites through curated topic collections. Users select a topic and click a jump button to explore sites, and a Chrome extension is offered.
JupyterLab is an extensible notebook authoring application and editing environment within Project Jupyter. A notebook combines code, text descriptions, data and visualizations. JupyterLab provides an environment for prototyping and explaining code, exploring and visualizing data, and sharing ideas. It is a sibling to Jupyter Notebook and Jupyter Desktop and is described as offering a more advanced, customizable experience than Jupyter Notebook.
JustSketchMe is a browser-based character posing tool for artists, using 3D models, props, lighting and a pose library to build pose references. It also offers exporting screenshots and 3D models. Apps are listed for iOS, Android, Mac and Windows. The project is free, with a Pro tier available via subscription.
Kahvibreak is a collection of Java 2 Micro Edition mobile phone games presented through the Flashpoint Launcher and emulated with the J2ME emulators KEmulator and FreeJ2ME. The project states the most appropriate emulator is picked for each game, and a version of Java is included so users do not need to install it.
Kalker is a scientific calculator application that supports user-defined variables and functions, ambiguous input syntax, differentiation, integration and complex number calculations. It runs natively on Windows, macOS, Linux and Android, and operates in web browsers via WebAssembly. The tool uses math-like syntax for input and supports sum calculations alongside standard and advanced mathematical operations.
Kanazawa Medical University maintains a news page listing institutional announcements and research items. Entries include a call for applications for a full-time English faculty position, appointments of faculty to editorial roles, and published research on ventricular arrhythmias and mouse zygote development. A brochure is available for download.
Kando is an open source, cross-platform pie menu for launching applications, executing keyboard macros and opening files. It is designed for mouse, stylus, touch or controller input, and supports Windows, macOS and Linux. Menus can be bound to shortcuts and nested into submenus, and it is described as completely free.