Mulligan Monster Internet Atlas
Find useful websites without the noise.
Explore human-reviewed tools, guides, and communities for learning, researching, building, and getting things done.
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Free Website Accessibility Testing Tools
Practical tools for finding accessibility problems in web pages before a manual review.
More reviewed guides
All topicsOpen Image Libraries with Reuse Information
Large cultural collections that provide rights or reuse information with individual images.
Free U.S. Government Data Websites
Official starting points for public statistics, datasets, and documentation from U.S. agencies.
Free Coding Practice and Learning Websites
Structured lessons, documentation, and practice for learning web development and programming.
Free Language Learning Websites
Substantial free courses for listening, vocabulary, grammar, and practical comprehension.
Free Digital Archives for Primary Sources
Searchable collections of historical documents, photographs, recordings, and archival descriptions.
Free Online Mapping and Geography Tools
Public maps and geographic tools for place lookup, topography, boundaries, and open map data.
Recently reviewed resources
Browse all resourcesVLC media player
Playing many media formats and performing straightforward local conversions
Smithsonian Open Access
Museum and research images released for broad reuse
data.census.gov
Population, housing, business, and geographic tables
Digital Public Library of America
Searching cultural heritage collections across the United States
Library of Congress Digital Collections
U.S. history, maps, photographs, newspapers, recordings, and manuscripts
ANDI
Inspecting accessible names, focus order, tables, links, and page structure
The Met Open Access
Public-domain images of artworks across many cultures and periods
National Gallery of Art Open Access
Open images of works the National Gallery believes are in the public domain
Browse subjects
- Technology 44 resources
- Education 19 resources
- Geography 11 resources
- History 11 resources
- Government and Data 11 resources
- Arts and Culture 11 resources
- Writing 10 resources
- Science 9 resources
Useful context, not just links
Selected by people
Public resources are reviewed before they appear in the Atlas.
Explained clearly
Each listing says what it is best for and notes important limitations.
Checked over time
Destinations are revisited so broken or outdated resources can be reviewed.