The National Portrait Gallery's online collection provides a searchable database of portraits from the 8th century to the present day. It covers a primary collection of more than 11,000 paintings, drawings, miniatures and sculptures, a photographs collection of over 250,000 items and a reference collection of over 70,000 portraits. Themed groups and a Schools hub with art and history resources are also listed.
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Núcleo do Conhecimento catalogues regional films and television dramas for online browsing and playback.
An online number plate check that uses a UK registration number to retrieve vehicle information. The page states that the free lookup shows MOT history, tax status, mileage records and more, and that it queries official data sources, primarily the DVLA.
Nunflix indexes movies and television series for browsing and online viewing with genre browsing.
The NWT Discovery Portal is administered by the NWT Cumulative Impact Monitoring Program, and serves as a comprehensive online source for environmental monitoring knowledge in the Northwest Territories. It functions as a search tool for environmental data, metadata and reports, and allows users to upload and share research and monitoring information.
Online movies and television series catalogue from Nxsha with genre browsing, designed for browser playback.
Nyora is a free online manga reader that runs in the browser without install or sign-up. It offers a standard and webtoon reader, favourites, reading history, AniList tracking and Google cloud sync, and is an installable, offline-capable PWA also available on Android, Windows, macOS, Linux and iOS.
NZ On Screen is an online showcase of New Zealand television, film, music video and web series. The site presents curated collections, popular and recently added titles, and feature films available to rent. A rental example is NZ On Scream - Halloween Hits to Rent, with titles listed at $6.99 per rental. No subscription is required.
Oakland University offers over 250 undergraduate and graduate degree programs across its schools and colleges. Students can participate in research as early as their first year, access hands-on learning and internship opportunities, and enroll in online learning options.
Obsidian is a free and flexible note-taking app that stores notes privately on the user's device, including offline access. It supports links between notes, a graph view of relationships, Canvas for visual layout, and thousands of plugins and themes. Obsidian Sync provides end-to-end encrypted sync across devices, and Obsidian Publish turns notes into an online site. Optional add-on services are billed per user or site per month, billed annually.
OC Weekly is a newspaper published since September 1995 serving Orange County and Long Beach, covering local news, politics, arts, culture and entertainment. Its about page lists a weekly circulation of 45,000 and print and online readership figures.
Online portal dedicated to Occitan language and culture.
OceanHero is a web search engine or search directory for finding websites, pages, and online information.
OceComic is a site for reading comics online for free, listing comics from publishers such as Marvel, DC, Image, Boom Studios, IDW, Dark Horse and others. The page shows popular, new and featured series and writers.
OCR tool for extracting readable text from images, screenshots, and scanned files.
OCR.space is a hosted online OCR service that converts images and PDF documents into editable text and can create searchable PDF files. It is free to use without registration, accepts JPG, PNG, GIF and PDF files, and supports multi-page documents and multi-column text. The free tier limits files to 5MB per document, and uploaded files and extracted text are deleted immediately after processing.
OCRTool.net is a free online OCR tool that extracts text from images, PDFs and screenshots using Mistral AI's OCR model. It supports JPG, PNG, WEBP, BMP, GIF and PDF files up to 20 MB per file, with multi-language recognition and layout-aware conversion. No signup is required, no watermarks are added, and files and extracted text are not stored.
Odamex is a free, cross-platform client-server modification of the Doom engine that lets players join servers dedicated to playing Doom online. It is available for Mac, Windows and Linux, and a copy of Doom, Doom II, Freedoom or Chex Quest is recommended to play.
Find digitized publications and collection items through an online library.
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.
Online database for accessing the German National Library authority file.
OH SHINT! is an OSINT resource for online investigations, research links, search methods, and public data tools.
Find digitized publications and collection items through an online library.
Ohio University is a public higher education institution offering more than 250 undergraduate and graduate academic programs. It operates eight campuses across the U.S. state of Ohio and online learning options, and is the state's leading producer of health professionals. The university delivers career-focused educational experiences and offers the OHIO Guarantee, which provides $0 tuition and fee increases.