Open Knowledge & Digital Archives

Free, open-source system cleaner, security scanner, and privacy optimizer for Windows, macOS, and Linux — a transparent, ad-free alternative to CCleaner.

Dutch national museum offering free public domain downloads of hundreds of thousands of master artworks in ultra-high resolution.

Official statistical database of the Turkish Statistical Institute, publishing national socioeconomic, agricultural, and demographic data.

Acclaimed playground of brilliant interactive web toys, data games, and educational experiences created by developer Neal Agarwal.

The world’s premier chronometric resource for exact atomic time, time zones, sunrise/sunset, solar eclipses, and astronomy calendars.

Direct portal into the endless rabbit hole of human knowledge, delivering instant serendipitous articles from 6.8+ million encyclopedia entries.

Real-time audiovisual ambient experience transforming live Wikipedia edits and additions into soothing musical notes and expanding ripples.

The ultimate interactive genealogy and visual taxonomy of popular music genres, subgenres, and musical evolution from 1870 to 2016.

Open access collection of over 500,000 artworks and artifacts spanning 5,000 years of global human creativity at The Metropolitan Museum of Art.

Premier digital hub curating free online courses, audiobooks, classic movies, eBooks, and language lessons from top institutions.

Non-profit visual arts encyclopedia featuring 250,000+ artworks by 3,000+ artists across world art history movements.

Interactive online platform providing ultra-high-resolution gigapixel art scans, virtual museum tours, and cultural storytelling.

National digital platform unifying access to millions of cultural heritage materials from libraries, archives, and museums across the United States.

The original volunteer-driven digital library of over 70,000 free public domain eBooks across world literature and philosophy.

Non-profit digital library offering free universal access to millions of books, historical web pages, software, films, and audio recordings.

Interactive visual zoom slider scaling from the Planck length and quantum quarks up to observable cosmic galaxy filaments.

Interactive musical time machine letting users pick any country on the world map and any decade from 1900 to discover authentic vintage music.

Online journal and cultural archive dedicated to exploring curious, fascinating, and forgotten works from the history of art and literature.

European Union digital cultural heritage platform aggregating 50+ million artworks, artifacts, books, and sounds from 2,000+ European institutions.

The official national library of the United States, providing access to millions of historic manuscripts, prints, audio, and maps.

An open, editable library catalog striving to create a comprehensive web page for every published book in human history.