Hacker News RSS provides a free service that generates custom, real-time RSS, Atom, and JSON feeds for Hacker News, allowing users to filter posts by points, comments, keywords, users, and various categories like “Ask HN” and job listings.

Open-Source ☀️️️️️️️️️️️️️️️️️️️️️️️️️️️️️ Weather API with free access for non-commercial use. No API Key required ✅. Accurate weather forecasts for any location. Open-Meteo provides high-resolution open data ranging from 1 to 11 kilometers from national weather services. With a user-friendly JSON API, integrating weather data has never been easier. Experience the precision and convenience of Open-Meteo’s Forecast API for reliable and comprehensive weather information worldwide.

TheBigDB is a very loosely structured database of facts, free and open to everybody.