An online quiz buzzer for playing quiz games. It is free, supports unlimited participants and is mobile-friendly. Players write answers into a text field and buzz to send them, and hosts control rooms by clearing buzzes and removing users.
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JustDeleteAccount.com is a directory of links for deleting accounts from web services. It lists services and rates deletion difficulty from easy to impossible, with community votes and success figures reported for some services. The site states that deleting an unused account removes personal information from the internet and can help protect privacy.
Personal attack-surface monitoring and mitigation for people facing doxxing, impersonation, or physical-safety risks.
Kanata is a cross-platform software keyboard remapper for Linux, macOS and Windows. It provides multiple layers of key functionality and advanced key behaviour customization such as tap-hold, macros, and unicode. Running kanata does not start it in a background process, so the started window must remain running to keep it active.
KaraFun is an online karaoke service with a catalog of songs across multiple genres, studio-quality recordings and music quizzes. It offers battle and quiz modes, a remote control for guests, offline sync, vocal match, and customization of key and tempo. A free option provides free songs and Premium song previews, and plans unlock all songs on any device.
Kartograph.py is a Python library for rendering beautiful SVG maps. The project is currently unmaintained, but its source code remains available on GitHub. It allows users to create map visualizations programmatically.
Kasm Workspaces is a platform that streams applications, desktops and web resources to a web browser. It covers remote browser isolation, Desktop as a Service and OSINT workloads. Editions include Community, Starter and Enterprise.
KDE Connect is a project that enables communication between devices. It supports sharing files and links between devices, syncing phone notifications to the desktop, and remotely controlling music playback from a phone.
KeeperFX is an open-source remake and fan expansion of the game Dungeon Keeper, making it run on modern machines and adding fan-made content. It requires the original game files to operate. Features include Windows 7/10/11 support, higher screen resolutions, modernized controls, bugfixes, additional campaigns and maps, new creatures, textures and sprites, and multiplayer.
KidRex is a kid-safe search engine provided by Alarms.org using Google Custom Search. It is offered free of charge and as is, with ads supplied by Google. Alarms.org states that reported material unsuitable for children is removed at its sole discretion, and it advises against leaving children unsupervised online.
A page from the Kindle Modding wiki explaining what jailbreaking a Kindle is. It states that jailbreaking allows running external code on the device, such as KOReader or other apps, that other Kindle features remain, and that jailbreaking is a process rather than an app or firmware.
Koel is an open-source music streaming server that lets users host and stream their own music. It includes media management for uploads and metadata, Subsonic and OpenSubsonic API support, and iOS and Android apps. The Community version remains free and open-source; a paid Koel Plus version adds features such as individual libraries and storage drivers.
Kanji Koohii is a free website for studying Japanese characters with James Heisig's "Remembering the Kanji" method. It offers kanji mnemonics, a dictionary that highlights words using only learned kanji, and built-in flashcards with spaced repetition, reviewable on desktop and mobile.
kuake_cli helps upload, sync, or manage files across cloud storage, remote drives, or shared storage services.
Ladder is a self-hosted HTTP web proxy and developer tool for testing and analyzing paywall implementations and content delivery behavior on websites. It can remove or modify CORS and other headers, inject custom code, apply domain-based rulesets and emulate different client types. The project states it does not circumvent advanced access restrictions and may not function on services that actively restrict access.
LANDR is a music creation and release platform combining AI mastering, distribution, plugins, samples, collaboration tools and courses. The site describes unlimited AI mastering, distribution to over 150 streaming platforms, samples and effect and instrument plugins. It also lists online music courses and collaboration tools for remote sessions. Pricing is presented as starting at USD $8.25/month for LANDR Studio.
Lapce is a modern open source code editor written in Rust, featuring a native GUI with GPU acceleration in Floem. It offers remote development, built-in LSP support with Tree-sitter syntax highlighting, Vim-like modal editing and a WASI plugin system for writing plugins in languages that compile to WASI. It includes a built-in terminal.
Le Cinéma Club is a free, curated streaming platform that presents one film every Friday, available to watch for one week. The current selection, Test Piece, is a 19-minute 2025 short by LA-based director Kersti Jan Werdal, described as remixing film form.
LearnOpenGL is an online book and tutorial resource for learning modern core-profile OpenGL. It covers basics through advanced topics with clear examples and aims to be understandable for people without graphics programming experience while remaining useful to experienced readers. Chapters discuss core graphics concepts, lighting, model loading and post-processing, and a walkthrough series builds a small game.
Left on Read is a macOS desktop app that provides analytics and productivity tools for text messages, including revisiting messages, group chats and words of the year. It can schedule messages, send response reminders and manage an inbox. Texts are analyzed locally, and the software is open-source and runs offline. It is free to try.
LegitimateURLShortener helps remove popups, overlays, redirects, or unwanted page interruptions.
Lervos is a tool that generates freelance job proposals matched to a user's personal writing style and past project history. It remembers users' real projects and writing rules to produce platform-appropriate proposals in seconds, and offers a free starter tier with no credit card required.
LibreTexts is a non-profit open education resource platform for creating, customizing and sharing textbooks, adaptive homework and ancillary materials. It offers 17 subject libraries and over 2,000 textbooks, supports remixing chapters into custom textbooks, and includes the ADAPT homework system with a shared question bank.
LibreWolf is an independent custom version of Firefox aimed at privacy, security and user freedom. It uses privacy and security oriented settings and patches to increase protection against tracking and fingerprinting, and aims to remove telemetry, data collection and annoyances while disabling anti-freedom features such as DRM. uBlock Origin is included.