Open Library
An open catalog of every book.
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About Public APIs
A collaborative GitHub list of hundreds of free public APIs across every domain — the first stop when prototyping anything that needs data.
Key features
- Hundreds of categorized APIs
- Auth and HTTPS notes per entry
- Community-maintained
Pros
- Something for every side project
- Actively curated
Cons
- Link rot happens between updates
- Quality varies by API
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