addons.mozilla.org
Firefox Extension is a non-English technical, learning, or open source resource for regional audiences.
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addons.mozilla.org
FireMonkey is a Firefox browser extension that functions as a lightweight combined user script and user style manager. It provides similar functionality to user script managers such as GreaseMonkey, Tampermonkey and Violentmonkey, and user CSS managers such as Stylish, Stylus and xStyle. It supports GM3 and GM4 script functions, allows users to toggle scripts and CSS on or off via a toolbar button, contains no tracking or advertising, and is released under the Mozilla Open Source licence. It has experimental support for Firefox for Android.
fizzyed.it
fizzy is an open-source framework in Zig for editors and polished apps, built around a near-empty host, a stable SDK and plugins. It runs natively on macOS, Linux and Windows and in the browser. Its plugins include a file tree, text editing, markdown preview, image viewing, zip archives and Google Drive; the project is pre-1.0.
flameshot.org
Flameshot is a free and open-source, cross-platform screenshot tool with built-in editing features. Users select an area to capture, then annotate it with arrows, text, blur, borders and counters before saving. It offers a configuration dialog, a command-line interface for scripting, and downloads for Windows, macOS and Linux.
ruffle.rs
Ruffle is an open source Flash Player emulator written in Rust. It targets desktop and the web using WebAssembly and is intended to run Flash content natively on modern operating systems and browsers. The project reports partial ActionScript compatibility, with most AVM 1 content expected to work and AVM 2 support being improved.
flashpointarchive.org
Flashpoint Archive is a community effort to preserve games, animations, and interactive experiences from the web. It provides open-source software including a launcher, a proxy, and a sandbox for playback of plugin-enabled content.
flaviocopes.com
Flavio Copes is a personal site of articles about building software products, publishing them online, finding customers, and creating an independent business. Posts cover topics such as LiveKit Agents, OpenCode, LangChain and Apple TV apps. The site also lists apps, CLI tools, websites and open source tools made by the author.
stephango.com
Flexoki is an open-source color scheme for prose and code, designed for reading and writing on digital screens. Inspired by analog inks and paper, it is minimalistic and high-contrast, with colors calibrated for legibility across devices and light and dark modes. It is available for dozens of apps.
codeberg.org
FlickBoard is an Android keyboard that uses swipes to reduce the number of buttons compared with a traditional QWERTY keyboard. Letters in the center of a key are typed by tapping, and corner letters by swiping in that direction. The project states that it does not correct, predict, or use AI, and it is inspired by MessagEase and Thumb-Key.
fliphtml5.com
FlipHTML5 collects or organizes headlines and links for browsing news from multiple sources.
floatui.com
Float UI provides responsive website templates and UI components for React, Vue, Svelte and HTML built with Tailwind CSS. It describes the components as free and open-source and as copy-and-paste ready, alongside professional templates built on React and Next.js with Tailwind CSS.
floccus.org
Floccus is software for syncing bookmarks and tabs privately across browsers and devices. Apps are available for browsers, iOS and Android, syncing via a Nextcloud, Linkwarden, KaraKeep, Git or WebDAV server, or via Google Drive or Dropbox. It is free and open source software with no ads and no data collection. Safari is currently not supported due to technical limitations.
florisboard.org
Use an open-source keyboard on Android.
flowoss.com
Flow is a free, open-source, browser-based online EPUB reader usable as a progressive web app across web, Windows, Linux, macOS, Android and iOS. It supports reading multiple books at once, an offline-first mode after installation, and custom cloud storage. Data is stored locally in the browser using IndexedDB; Dropbox is the only supported cloud storage.
flowlauncher.com
Flow Launcher is a free and open-source file search and app launcher for Windows. A customizable hotkey triggers the search window, and it can open apps, search files and file contents, run web searches, find bookmarks, run system and shell commands, do calculations and search Windows settings. Plugins can be installed from a plugin store or written in C#, F#, Python, JavaScript or TypeScript.
flowiseai.com
FlowiseAI is an open source generative AI development platform for visually building AI agents and LLM orchestration systems. It offers features including multi-agent workflow orchestration, chat assistants with retrieval-augmented generation support, human-in-the-loop task review, execution tracing, and APIs, SDKs and embedded chat options for integration. The project notes it is being sunset.
hyliu.me
Fluent Reader is an open-source desktop RSS reader. It aggregates news sources and can sync with Inoreader, Feedbin, or services compatible with Fever or Google Reader API, or import sources from an OPML file for local reading. Sources can be organized into groups, and full data backups allow moving between computers.
fluentflyout.com
FluentFlyout is a free, open-source media control flyout app for Windows 11 built with Fluent 2 Design. It provides media playback controls that appear when volume is adjusted or media is played, including repeat, shuffle and a seek slider, plus flyouts for upcoming tracks and lock key status. It also offers a taskbar widget for media control and options for layout, themes and backdrop.
fluxnet.org
FLUXNET Data provides information about FLUXNET data and links to data availability, data policy, variable explanation, data processing, and where to download data. The FLUXNET Data Shuttle is described as fully operational since early 2026, available as an open-source software library and a web-based graphical user interface for discovering and accessing standardized flux data.
flyte.org
Flyte 2 is described as a durable AI runtime for running training, serving and agent workloads, with automatic recovery from infrastructure and code failures. Workflows are written in Python, and the project is distributed as Apache 2.0 open source under the Linux Foundation.
folderclone.com
FolderClone is a synchronization and backup tool for Windows that makes an identical copy of a folder from one drive to another. It runs in the background, periodically checking the source folder and updating the target with new or changed files. It can copy files between computers or replicate data to external drives, NAS or cloud storage such as OneDrive and Google Drive.
folio.org
FOLIO is an open source library services platform built by a collaboration of libraries, developers and vendors. It provides functionality for circulation, acquisitions, cataloging and e-resources management, along with inventory, vendor, budget, and user management. The platform is API driven and extensible, with features released through regular named releases.
gist.github.com
Font Piracy 101 helps clean, compare, sort, transform, count, or format text in the browser.
fontforge.org
FontForge is a free and open-source outline font editor. It is provided by a community of contributors, and the project offers documentation including a book titled Design With FontForge, an overview, a tutorial and technical references.