How to Choose the Best Open Source Projects API in 2026
There are 9 Open Source Projects APIs in our directory. Of these, 8 require no authentication, making them ideal for quick prototyping. 8 are rated beginner-friendly.
Scores last tested: 2026-08-10
Quick Comparison: Top 9 Open Source Projects APIs
Ranked by API Score. Measured means we called a real endpoint of that API; Est. means the score is derived from metadata because the endpoint could not be called without credentials. Discontinued APIs are excluded.
| Name | API Score | Auth | HTTPS | CORS | Difficulty |
|---|---|---|---|---|---|
| GitHub ReadMe Stats | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Metabase | 92 A+ Est. | No Auth | ✓ | ✓ | Beginner |
| Shields | 92 A+ Est. | No Auth | ✓ | ? | Beginner |
| Drupal.org | 88 A Measured | No Auth | ✓ | ? | Beginner |
| Evil Insult Generator | 87 A Est. | No Auth | ✓ | ✓ | Beginner |
| GitHub Contribution Chart Generator | 78 B Measured | No Auth | ✓ | ✓ | Beginner |
| Countly | 77 B Est. | No Auth | ✗ | ? | Beginner |
| Creative Commons Catalog | 74 B Measured | OAuth | ✓ | ✓ | Advanced |
| Datamuse | 71 B Measured | No Auth | ✓ | ? | Beginner |
Free Open Source Projects APIs (No Auth)
These APIs require no API key or signup. Start using them immediately.
Countly
Countly is an open-source product analytics platform, and its REST API lets you query event data, session metrics, user counts, and custom dashboards you have set up in your Countly instance.
Datamuse
⭐ Beginner's PickDatamuse is a free word-finding API that helps you discover words by meaning, sound, spelling, and context — no API key needed.
Drupal.org
The Drupal.org API gives you programmatic access to information about Drupal modules, projects, users, and releases hosted on drupal.org.
Evil Insult Generator
⭐ Beginner's PickThe Evil Insult Generator API returns randomly generated humorous (fictional) insults in multiple languages — no API key required.
GitHub Contribution Chart Generator
⭐ Beginner's PickThe GitHub Contribution Chart Generator API creates a visual representation of any GitHub user's contribution activity over the past year.
GitHub ReadMe Stats
⭐ Beginner's PickGitHub ReadMe Stats is an open-source API that generates dynamic SVG cards showing your GitHub statistics — repos, stars, commits, languages, and more.
Try It in 5 Minutes: Datamuse
Quick implementation example using Datamuse.
Using curl
curl "https://api.datamuse.com/words?ml=ocean&max=10"
JavaScript
const url = "https://api.datamuse.com/words?ml=ocean&max=10";
const response = await fetch(url);
if (!response.ok) throw new Error(`Request failed: ${response.status}`);
const data = await response.json();
console.log(data); New to APIs? Read our Getting Started Guide →
Frequently Asked Questions
How many Open Source Projects APIs are available?
There are 9 Open Source Projects APIs in our directory as of 2026.
Are there free Open Source Projects APIs?
Yes, 8 Open Source Projects APIs require no authentication and are completely free to use.
What is the easiest Open Source Projects API to use?
Datamuse is one of the easiest to get started with. It is rated as beginner-level and requires no authentication.
Do I need an API key for Open Source Projects APIs?
It depends. 8 APIs need no authentication, 0 require an API key, and 1 use OAuth.