https://github.com/public-apis/public-apis
- Animals
- Anime
- Anti-Malware
- Art & Design
- Authentication & Authorization
- Blockchain
- Books
- Business
- Calendar
- Cloud Storage & File Sharing
- Continuous Integration
- Cryptocurrency
- Currency Exchange
- Data Validation
- Development
- Dictionaries
- Documents & Productivity
- Entertainment
- Environment
- Events
- Finance
- Food & Drink
- Games & Comics
- Geocoding
- Government
- Health
- Jobs
- Machine Learning
- Music
- News
- Open Data
- Open Source Projects
- Patent
- Personality
- Phone
- Photography
- Programming
- Science & Math
- Security
- Shopping
- Social
- Sports & Fitness
- Test Data
- Text Analysis
- Tracking
- Transportation
- URL Shorteners
- Vehicle
- Video
- Weather
Public and with no auth
https://mixedanalytics.com/blog/list-actually-free-open-no-auth-needed-apis/
- including weather / METAR
- useful for flight sim