Obfuscator List is a GitHub repository or organization with source code, releases, documentation, or project resources.
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OBS Studio is free and open source software for video recording and live streaming, distributed under the GPLv2 license. It provides real time video and audio capturing and mixing, scenes made of multiple sources, and an audio mixer with per-source filters.
OCRmyPDF is a software tool that adds an OCR text layer to scanned PDF files, making the content of scanned documents searchable. It is maintained as an open source project on GitHub.
GNU Octave is a programming language for scientific computing with mathematics-oriented syntax and built-in 2D/3D plotting and visualization tools. It is free software licensed under the GNU General Public License and runs on GNU/Linux, macOS, BSD, and Microsoft Windows. Its syntax is largely compatible with Matlab, and it can be extended by packages.
Octobox is a notification manager for GitHub. It adds an archived state to notifications so they can be marked done, and moves archived threads back into the inbox when activity occurs. Notifications can be searched and filtered by repository, organisation, type, action, state, CI status and reason. Octobox is free for open source projects, with paid private repository access available by donation or through the GitHub Marketplace.
OctoDroid is a GitHub repository or organization with source code, releases, documentation, or project resources.
Octopus.do is a visual sitemap and website planning tool. It offers a visual sitemap builder with lo-fi wireframes for prototyping website architecture, and allows crawling a website, choosing a template, or generating with AI. Sitemaps can be shared without sign-up, and exports include PNG, PDF, Excel, Figma, and WordPress.
Search tool for discovering public GitHub repositories, code, users, and project references.
Odcrawler Discovery is a GitHub repository or organization with source code, releases, documentation, or project resources.
Odoo offers a free, open-source website builder and CMS. The AI-powered configurator creates a website through steps including setting business type, selecting a color palette, uploading a logo and picking a theme. Pages are built with drag-and-drop blocks, and features include mobile responsiveness, translation, SEO tools and analytics.
The Open Energy Data Initiative (OEDI) is a searchable online software discovery platform and knowledge base developed by NLR and powered by OpenEI. It provides open access to energy data and information to support research, collaboration and transparency, with features including curated data lakes, solar systems integration data and analytics tools, and a siting lab.
OG Image Generator is a free web tool for creating open graph images, social media previews, and Twitter cards. It offers customizable templates, fonts, and optional app screenshot support, exporting images as 1200×630 PNG files.
Ogmo Editor 3 is a free, open source, project oriented level editor made for indie game developers by indie game developers. It offers a project based workflow, layer types for tiles, decals, entities and grids, and saves levels to JSON files. It is free to use for personal and commercial projects and is open sourced under the MIT license.
Oh My Posh is a prompt engine for shells, with one configuration intended to work across PowerShell, Bash, Zsh, Fish, Nu and others on Windows, macOS, Linux, WSL, containers and SSH. It is written in Go, and its segments run concurrently and cache results so prompts render in milliseconds. Around 120 segments cover git status, cloud context, language versions and system metrics.
Omni Route is a GitHub repository or organization with source code, releases, documentation, or project resources.
OmniRoute by Cheaper Inference is an open-source AI router that routes requests across providers through one OpenAI-compatible endpoint, with automatic fallback. It accepts OpenAI, Claude, Gemini and Responses API requests at /v1 and ships as a self-hosted gateway with a local dashboard. The catalog covers chat, media, search, local runtimes and cloud agents.
Ondoku is text-to-speech software that reads text up to 5,000 characters free of charge and offers paid plans converting up to 1 million characters a month. Generated audio can be saved as MP3 files and used commercially. It runs in a browser on PC or smartphone without installation.
one sec is a screen time management application that uses scientifically backed methods to help users reduce their screen time. It can limit social media use, block websites and apps, and interrupt scrolling habits to break the cycle of social media dopamine hits. The application’s approach has been studied in partnership with the Max Planck Institute and Heidelberg University.
OneCompiler is an online code editor and compiler for writing, running and sharing code in the browser. It supports coding agents, embeddable editor and challenge widgets, and APIs for code execution in 110+ languages.
Onelang is a browser-based IDE for cross-language editing, exposed through a web interface. The page notes that unsupported browsers may not work and recommends the latest Chrome or Firefox. It offers demos covering generic features, reflection, inheritance, big integers, JSON handling and Hello world, and states that the compiler backend requires authentication.
OneLinePlayer is a free web video player for Vimeo and Dropbox videos. It uses a direct link to a video file and offers preview images, player style adjustments, and controls such as autoplay, loop and mute. A GIF mode is available. The makers state they are not a video hosting platform. Certain Vimeo controls customization requires a Vimeo Plus plan or above.
MediaInfoOnline is an online file analyzer that lets users run MediaInfo in a browser without installing software on their computer. Files are dragged into the page and an MediaInfo report is displayed; processing stays on the user's machine and nothing is uploaded to servers. It is provided as a technology preview.
OnlineRadioBox is a directory and player for free internet radio stations from around the world. It organizes stations by region and country, supports searching by station name, genre or country, and lets users listen directly in a browser without installing software. It also offers a free mobile app for Android and iOS.
OONI, the Open Observatory of Network Interference, is a global community measuring internet censorship. OONI Probe tests the blocking of websites and apps and measures network speed and performance, while OONI Explorer displays censorship data collected from over 200 countries since 2012.