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A free online tool that scans webpages for dead hyperlinks. It checks internal and external URLs, reports the location of bad links in HTML code, shows 404 errors and other unsuccessful HTTP response codes, and supports sub-domains. The free version limits checks to 3,000 pages and allows one running session per IP address; documents and images are not checked.
An online tool that parses the HTML of a web page and extracts its internal and external links, displaying them in plain text. After a page address is submitted, the system downloads the page and lists the resulting URLs. It is built with the Lynx command-line browser and described for research, development, security assessments and web page testing.
Online2PDF is a free online PDF converter that combines conversion, merging, editing, compression, unlocking and protection in one interface. It converts Word, Excel, PowerPoint, OpenOffice, image and XPS files to PDF and exports PDFs to Word, Excel, PowerPoint and JPG. It also supports page extraction, reordering, splitting, rotation and removing printing or editing restrictions.
onUI is a browser extension for Chrome, Edge and Firefox with a local MCP bridge, used to annotate or draw on any web UI and export structured context for AI agents. Annotations require no app code changes; per-tab control is off by default.
Onyx is a distributed, masterless data processing system written in pure Clojure, with a batch and stream hybrid processing model. The repository is archived and read-only. Listed uses include realtime event stream processing, extract, transform, load, and data cleaning.
OpaLingo is a free online Macedonian language course with interactive lessons, audio pronunciation, vocabulary games and Cyrillic alphabet training. It offers a structured learning path from alphabet to conversation, with progress saved locally. Optional Premium adds extra games, learning analytics and cosmetics.
A Central Bank of Bosnia and Herzegovina page linking to data described in the International Monetary Fund's DSBB under the Special Data Dissemination Standard. It lists datasets across the real, fiscal, financial and external sectors, including national accounts, labor market, prices, government operations and debt, depository corporations, balance of payments and exchange rates, each with browse, download and SDMX options.
OpenDataPhilly is a catalog of open data in the Philadelphia region. It is the official open data repository for the City of Philadelphia and also includes data sets from many organizations in the region. The catalog covers categories such as arts, culture and history, boundaries, budget and finance, economy, education, elections and politics, environment, food, health and human services, parks and recreation, planning and zoning, public safety, real estate and land records, and transportation.
The Open Exoplanet Catalogue is a decentralized, open-source database of discovered extrasolar planets. The website displays the catalogue in a browser, while the data is stored as human-readable XML files in a git version control system. Contributions and corrections are accepted from professional astronomers and the public, and data can be downloaded from the GitHub repository.
Open UI is a W3C Community Group that aims to let web developers style and extend built-in web UI components and controls such as dropdowns, checkboxes, radio buttons, and date or color pickers. The group plans to specify component parts, states, behaviors, accessibility requirements and test suites, and to implement polyfills for extensible controls.
Open WebUI is a self-hosted AI interface for running AI on the user's own hardware. It connects to local or cloud models including Ollama, OpenAI, Anthropic, or compatible services, and can be extended with Python. The project offers community-shared prompts, models, tools, and functions, and lists deployment options including on-premises or air-gapped setups. Installation can be done with a pip command.
Open-Multiple-URLs is a browser extension for Chrome and Firefox that opens a list of URLs at once and extracts URLs from text. It is built with Vue.js on top of WebExtension and supports cross-browser use. Input text and options are saved locally, and tabs can be opened in random order.
OpenCode is an open source AI coding agent available as a terminal-based interface, desktop app, or IDE extension. It supports multiple LLM providers and local models, and does not store code or context data. Enterprise options include centralized configuration, SSO integration, and an internal AI gateway.
MinerU is a tool that transforms complex documents such as PDFs and Office documents into LLM-ready markdown or JSON for agentic workflows. It supports multiple input formats including PDF, images, DOC/DOCX, PPT/PPTX, XLS/XLSX, RTF, ODT/ODS/ODP, EPUB, OFD, HTML/MHTML and CSV/TSV. Version 4.0 offers four parsing tiers and a document library with search and citation locators, and documents are not automatically uploaded to the official service; remote parsing requires explicit configuration.
OpenFOAM is a free, open source computational fluid dynamics (CFD) software developed primarily by OpenCFD Ltd since 2004. It offers an extensive range of features for solving complex fluid flows involving chemical reactions, turbulence and heat transfer, as well as acoustics, solid mechanics and electromagnetics. Releases are scheduled every six months, and the software is distributed under the GPL v3 licence.
openmediavault is a free, open-source network attached storage solution based on Debian Linux. It provides services such as SSH, SMB/CIFS, RSync and a BitTorrent client, with web-based administration for storing, sharing and backing up data on hardware the user controls. Plugins extend the system with additional functionality.
OpenMetadata is an open-source AI context layer powered by metadata, semantics, and memory that provides a shared, rich understanding of data for people and AI. It was built by the founders of Apache Hadoop, Apache Atlas, and Uber Databook. The unified platform supports data cataloging, discovery, quality, observability, governance, lineage, and collaboration.
OpenMoji is an open source emoji project from students and professors at HfG Schwäbisch Gmünd and external contributors. It offers over four thousand emojis in colored and outlined styles, supports the Unicode Emoji standard and Fitzpatrick skin tones, and is free to use under the CC BY-SA 4.0 license.
Apache OpenNLP is a machine learning based toolkit for the processing of natural language text. It supports tasks such as sentence segmentation, tokenization, lemmatization, part-of-speech tagging, named entity extraction, chunking, parsing, language detection and coreference resolution. The project is developed by volunteers and welcomes contributions, from small documentation fixes to new components.
Bring multiple data streams into one dashboard.
OpenRefine is a free, open source tool for working with messy data. It enables users to clean data, transform it between formats, and extend it with web services and external data. All data processing occurs locally on the user's machine rather than in cloud services. Key features include faceting to drill through large datasets, clustering to fix inconsistencies by merging similar values, reconciliation to match datasets to external databases, infinite undo/redo functionality, and support for contributing to Wikidata and other Wikibase instances.
OpenSCAD is free software for creating solid 3D CAD models, available for Linux/UNIX, Windows and Mac OS X. It is not an interactive modeller; instead it reads a script file describing an object and renders the model. It focuses on CAD aspects rather than artistic modelling and provides constructive solid geometry and extrusion of 2D outlines.
Model Context Protocol - An open standard for connecting AI models to external tools and data sources. MCP Registry.
Gitingest converts any Git repository into a prompt-friendly text ingest for LLMs. Users can replace hub with ingest in any GitHub URL to access the corresponding digest. It provides a text digest from a repository URL or directory, with smart formatting for LLM prompts and statistics on file and directory structure, extract size and token count. It is available as a CLI tool and Python package.
