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.
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Jellyfin Vue is a modern web client for the Jellyfin media system, built using the Vue framework. It is part of the Jellyfin Project, offers end-user usage instructions and supports hosted instances. The project is maintained as an open-source repository on GitHub.
Jellyfin Desktop is a desktop client for Jellyfin built with Qt WebEngine and libmpv. It is distributed under the GPL-2.0 license and supports audio passthrough, hardware decoding, and playback of more formats without transcoding. It is available for Linux, macOS and Windows, with data stored per profile in a profiles subdirectory.
JetBrains is a software vendor that creates intelligent development tools, including IntelliJ IDEA, an IDE for Java and Kotlin, and the Kotlin programming language. Its IDE lineup also includes PyCharm, WebStorm, DataGrip, Rider and CLion, several of which are free for non-commercial use.
A course on generative modelling, currently unfinished, with the first approximately five lessons mostly done. It covers topics such as PyTorch basics, representations, CLIP, GANs, sequence modelling and transformers. No prior deep learning knowledge is assumed, though comfort with some Python and Jupyter Notebooks is expected.
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.
JPixel is a downloadable editor for Windows for making pixel art animations and tilesets. Animations can be exported as spritesheets or animated GIFs, and tilesets can be mocked up and exported as .png images. It is distributed on itch.io on a name-your-own-price basis.
The JRC Data Catalogue is the data catalogue of the European Commission Joint Research Centre. It provides access to 4315 datasets and 257 collections covering topics including environment, energy, climate change, and agriculture. The platform offers SPARQL search, a catalogue API, and links to related EU data resources.
JuMLi provides automated feedback on RimWorld modlists. Users export their modlist from RimSort to the clipboard, paste it into a text field, and submit it; the site then presents notes on the list. The page advises using RimSort rather than in-game sorting or RimPy.
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.
Jupyter AI is an open source extension that connects AI agents to computational notebooks in JupyterLab. It provides a native chat UI and integrates agents through the Agent Client Protocol, with a permission system requiring approval before files are written or commands executed. It is under incubation in the JupyterLab organization.
Searchable repository for finding atmospheric, oceanography and climate datasets and datasets.
JWildfire is a video tool for editing, effects, stock footage, animation, 3D, or creator workflows.
Tools, and instructions for more easily installing and launching Windows games via Wine or CrossOver directly in the macOS Steam client
Kettu is a Discord mobile app client modification described as continuing Bunny's mission. It is written mainly in TypeScript and published on Codeberg, where installation instructions cover Android via Xposed or KettuManager and iOS via KettuTweak. The repository also includes build steps using bun.
Kettu is a Discord mobile app client modification that continues Bunny's mission. The repository is a mirror of the Codeberg repository, and the README directs pull requests and issues there. Installation requires a Kettu loader, with separate options listed for rooted Android with Xposed, non-root Android through KettuManager, and iOS through KettuTweak.
Kilo is an open source AI coding agent for VS Code, JetBrains, CLI, desktop and cloud. It offers access to 500+ models at zero markup, bring-your-own keys, or local models for privacy. Kilo Gateway provides a unified API to access AI models through a single endpoint.
Kingston Data is a site from the Royal Borough of Kingston upon Thames Council that gathers local data and information for insight into the borough and comparisons locally and nationally. It offers a ward profile search by postcode or ward name or map click, plus themes including population, children and young people, health and social care, housing, crime and community safety, deprivation, economy and employment, and environment.
KISS Translator is a simple, open-source bilingual translation extension and userscript. It supports bilingual webpage translation, input-field translation, selection word lookup, and mouse-hover translation, and includes YouTube bilingual subtitles with configurable subtitle styles. It lists built-in services such as Google, Microsoft, Baidu, Tencent, DeepL, OpenAI, Gemini, Claude, Ollama, and DeepSeek. The README notes that provider plugins, Local AI, file translation, and automatic clipboard translation are available only in the Chrome/Edge and Firefox extension builds, not in userscripts and other clients.
Video clipping tool for creating short clips from longer recordings or streams.
The KNMI Data Platform (KDP) is an open-access repository for datasets maintained or generated by the Royal Netherlands Meteorological Institute (KNMI), covering weather, climate, and seismology topics. It replaced the KNMI Data Centre in 2020. All datasets are free to use, with metadata browsable on the platform website and data accessible via APIs including Open Data, WMS, and EDR APIs.
Knots 3D is a reference platform with over 200 animated knots and step-by-step tutorials. Its library covers categories such as climbing, fishing, sailing, camping, and scouting knots, with user reviews cited on the site. The site warns that users should verify tying technique with a skilled instructor where knot failure could cause property damage, injury, or death.
Konvert is a browser-based image format converter. It converts HEIC, WEBP and AVIF images to JPG. The site states that conversion happens client-side, so files do not leave the device, and that there are no restrictions or accounts.
Koala AI is an AI SEO platform. It includes an SEO agent that plans from Search Console data, a writer that drafts on-brand articles, and one-click publishing to a CMS. It also bundles KoalaChat, KoalaImages, KoalaLinks and KoalaMagnets. KoalaLinks is an internal linking tool that works with WordPress, Shopify, Webflow, Ghost and custom sites.