Open Source Projects – Free-tier APIs
11 Free-tier APIs in the category Open Source Projects. Free public web APIs that developers and AI agents can call. Entries come from the open public-apis list; each link was checked automatically (HTTP status) on the date shown, which says the site responded, not that the API is good.
Countly
Countly web analytics
Creative Commons Catalog
Search among openly licensed and public domain works
Datamuse
Word-finding query engine
Drupal.org
Drupal.org
Evil Insult Generator
Evil Insults
GitHub Contribution Chart Generator
Create an image of your GitHub contributions
GitHub ReadMe Stats
Add dynamically generated statistics to your GitHub profile ReadMe
Libraries.io
Metadata, dependencies and release history for open-source packages across 30+ managers
Metabase
An open source Business Intelligence server to share data and analytics inside your company
Neuronto ARD Registry
Search index of MCP servers, agents and APIs, with the tools each server actually exposes
Shields
Concise, consistent, and legible badges in SVG and raster format