Developer Hub

Hugging Face

Hub for open models, datasets and hosted demos you can try in the browser.

HuggingChat

Chat interface running open-weight models hosted by Hugging Face.

Groq

Very fast hosted inference for open models, with a free developer tier.

OpenRouter

One API key for many models, including a rotating set of free ones.

Jan

Desktop app that runs open models fully offline on your own machine.

LM Studio

Download and chat with local models through a friendly desktop interface.

Open-Meteo

Keyless global weather forecasts, historical data, air quality and marine API.

Open-Meteo Air Quality

Hourly PM2.5, PM10, pollen and US/EU AQI for any coordinate.

Open-Meteo Geocoding

Search city names to coordinates with population and timezone metadata.

Sunrise-Sunset

Sunrise, sunset and golden-hour times for any lat/lng, no key needed.

USGS Earthquakes

Real-time worldwide earthquake feed queryable by magnitude, time and region.

CoinGecko

Crypto prices, market caps and 24h change; free tier needs no key.

Frankfurter

ECB-backed currency conversion with no key and no rate limit.

ExchangeRate-API (open endpoint)

Daily-updated fiat rates; the open endpoint works with no key at all.

Yahoo Finance chart (unofficial)

Unofficial JSON quote endpoint for stocks and indices like ^NSEI.

NASA APOD

Astronomy Picture of the Day plus Mars rovers, NEOs and EPIC imagery.

WhereTheISS.at

Live International Space Station position, altitude and velocity, no key.

SpaceX Data (r/SpaceX)

Community-maintained launch history, rockets, ships and Starlink data.

Open Notify

Tiny classic API for ISS location and humans currently in space.

data.gov.in APIs

Thousands of Indian government datasets via API - agriculture, PIN codes, prices.

India Post PIN Code API

Look up post offices by PIN code with district and state details.

World Bank Open Data

Development indicators for every country - GDP, literacy, energy - no key.

REST Countries

Country profiles: flags, capitals, currencies, languages and timezones.

HackerNews Firebase API

Read-only Hacker News items, users and top/new/best story lists.

rss2json

Turns any RSS feed into clean JSON without writing a parser.

Reddit JSON endpoints

Append .json to almost any Reddit URL to get its data as JSON, no OAuth needed.

TheMealDB

Recipes with ingredients, steps, categories and images; test key '1' is free.

TheCocktailDB

Cocktail and mocktail recipes with ingredients, glassware and images.

Open Food Facts

Crowdsourced nutrition and ingredient data for millions of packaged foods.

PokéAPI

Every Pokémon's stats, moves, evolutions and sprites, fully keyless.

SWAPI

The original Star Wars data API - films, characters, planets, starships.

Rick and Morty API

Characters, locations and episodes from the show, GraphQL included.

Open Trivia DB

Quiz questions across categories and difficulty, session tokens included.

JokeAPI v2

Programming and general jokes with safe-mode filtering, no key.

Chuck Norris IO

Random Chuck Norris jokes grouped into categories, no key.

ZenQuotes

Inspirational quotes of the day and random quotes, no key.

Advice Slip

One random piece of advice per request, searchable by topic.

Bored API

Suggests a random activity when you have nothing to do.

Lyrics.ovh

Simple keyless lyrics lookup by artist and song title.

iTunes Search

Apple's keyless search over music, movies, podcasts, apps and books.

Deezer Public API

Music search with 30-second previews and charts, no auth for reads.

IP-API

Geolocate an IP to city, ISP and timezone; no key for non-commercial use.

IPinfo

Accurate IP lookup with ASN and company data on a generous free tier.

OSM Nominatim

OpenStreetMap geocoding and reverse geocoding, no key, fair-use policy.

OpenCage Geocoder

Forward/reverse geocoding built on open data with a real free tier.

WorldTimeAPI

Current time and offsets for any IANA timezone, no key.

GeoNames

Millions of place names with postal codes, elevation and population.

Aladhan

Prayer times, Hijri calendar conversion and Qibla direction worldwide.

The Color API

Color names, schemes and HEX/RGB/HSL/CMYK conversions, no key.

Colormind

Deep-learning color palette generator returning five hex colors per call.

DiceBear Avatars

Deterministic SVG avatars from any seed across 30+ art styles, keyless.

UI Avatars

Generate initial-letter avatar images straight from a URL.

Picsum Photos

Random Unsplash-sourced placeholder photos served by size URL.

Clearbit Logo API

Fetch a company logo image directly from its domain, no key.

Microlink

Extract metadata, screenshots or PDFs from any URL on a free tier.

Shodan InternetDB

Check any IP for open ports, vulnerabilities and hostnames, no key.

AbuseIPDB

Reputation check on IPs - spam, brute-force and abuse reports.

UK Carbon Intensity

Real-time grid carbon intensity and generation mix for Great Britain.

Dog CEO API

Over 20,000 indexed dog images browsable by breed, no key.

DummyJSON

Fake products, carts, users, recipes and auth flows for prototyping.

JSONPlaceholder

The classic fake REST API of posts, todos and albums for demos.

RandomUser.me

Generate consistent fake user profiles with photos for UI testing.

Agify / Genderize / Nationalize

Estimate age, gender and nationality probabilities from first names.

Wikipedia API

Search, summaries and full article content from Wikipedia, keyless.

Open Library

Books, authors, covers and reading lists from the Internet Archive.

GitHub REST API

Repos, users, issues and trends; 60 unauthenticated requests/hour.

PageSpeed Insights API

Google Lighthouse scores and Core Web Vitals for any URL.

openFDA

US drug approvals, recalls, adverse events and device safety data.

US Census Bureau API

Population, housing and demographic statistics down to block level.

Stable Diffusion WebUI

Local browser interface for generating images with open diffusion models.

Whisper

Open speech-recognition model for transcribing audio in many languages.

free-programming-books

Vast index of freely available programming books and courses by language.

public-apis

Directory of free public APIs grouped by topic, with auth and HTTPS noted.

awesome-selfhosted

Catalog of software you can host yourself instead of renting as a service.

build-your-own-x

Step-by-step guides to rebuild real technologies from scratch to learn them.

n8n

Workflow automation you can self-host to connect apps and APIs visually.

LocalAI

Drop-in local API compatible with common AI endpoints, no GPU required.

Open WebUI

Self-hosted chat interface for local and remote language models.

Termux

Linux terminal environment on Android with no root required.

Shields.io

Generates the status badges you see at the top of most READMEs.

cross-platform-llm-client

A cross-platform client for chatting with local language models.

PrivateAgent

Open-source Android agent that reads your screen and performs multi-step tasks from plain-language instructions.

System Design Primer

Open-source study guide for scalable systems design interviews.

Devhints

Dense one-page cheat sheets for tools, languages and command lines.

Machine Learning Specialization

Andrew Ng's updated ML specialization; every course can be audited free.

Kaggle Learn

Short hands-on micro-courses on Python, ML, SQL and data viz with badges.

fast.ai Practical Deep Learning

Train working neural networks from lesson one; top-down and code-first.

Microsoft Learn

Official free training for Azure, Power BI, Python and AI services.

Full Stack Open

University of Helsinki's React, Node, GraphQL and TypeScript course.

MIT Missing Semester

Shell, Git, debugging and tooling skills lectures skip over.

A Tour of Go

Interactive browser tour through the entire Go language.

AWS Skill Builder (free tier)

600+ free AWS digital courses plus cloud quest practice labs.

RegexOne

Learn regular expressions step by step with instant practice problems.

Git Immersion

Guided lab-style walk through Git fundamentals in ~50 steps.

Diffchecker

Compare two blocks of text, files or images side by side.

regex101

Build and debug regular expressions with a live explanation of each token.

Excalidraw

Hand-drawn style whiteboard for diagrams, no account needed.

QR Code Generator (nayuki)

Reference QR implementation plus a browser demo that runs entirely client-side.

roadmap.sh

Visual step-by-step learning paths for developer and data roles.

MDN Web Docs

Authoritative reference for HTML, CSS, JavaScript and browser APIs.

r/learnprogramming wiki

A maintained index of free courses, books and project ideas for beginners.

Dev.to

Developer articles that stay free to read and free to publish on.

Hacker News

Tech and startup links with comment threads that are often better than the link.

Eloquent JavaScript

The free online book that teaches JS deeply, with an in-page sandbox.

The Rust Programming Language

The official Rust book, completely free and considered best-in-class.

javascript.info

The Modern JavaScript Tutorial - exhaustive, free and translated widely.

CSS-Tricks guides

Deep single-topic guides like the legendary Complete Guide to Flexbox & Grid.

roadmap.sh DevOps Roadmap

Community-vetted DevOps learning path with linked free resources.

Exercism

Practice exercises in 70+ languages with free human mentoring.

Project Euler

Math-plus-programming puzzles that build genuine problem-solving muscle.

Fireship

Fast, dense overviews of web technologies and developer news.

NetworkChuck

Approachable networking, Linux and self-hosting walkthroughs.

Yannic Kilcher

Deep paper walkthroughs and frank takes on new AI models.

Andrej Karpathy

From-scratch neural network lessons by a former Tesla AI director.

The Primeagen

Opinionated programming culture, Vim and Rust content with real depth.

Theo (t3.gg)

Web framework news, ecosystem drama and tooling reviews from a practitioner.

Web Dev Simplified

Clear short lessons on JavaScript, React and CSS concepts.

Kevin Powell

The go-to channel for modern CSS explained calmly and correctly.

Traversy Media

Crash courses on nearly every web technology and framework.

ByteByteGo

System design concepts animated clearly - caching, load balancers, queues.

Hussein Nasser

Databases, networking and backend internals explained from the trenches.

TechWorld with Nana

DevOps bootcamps - Docker, Kubernetes, CI/CD and Terraform.

Rob Mulla

Practical pandas and Python data-wrangling walkthroughs.

Data School

Focused scikit-learn and pandas lessons for working analysts.

Nicholas Renotte

End-to-end applied ML projects in Python, explained energetically.

DesignCourse

UI design critiques and front-end implementation together.

Juxtopposed

Playful experiments in UI, motion and creative coding aesthetics.

Sentdex

Applied Python: finance bots, game AI and ML with real datasets.

Programming with Mosh

Polished full-length courses on Python, JS, C# and interview prep.

Tech With Tim

Python, Discord bots and modern web projects step by step.

Corey Schafer

Widely considered the cleanest Python tutorials on YouTube.

Real Python

Video companion to the respected Real Python written tutorials.

r/DataHoarder

Archiving, backups and public dataset rescue, with a deep resource wiki.

r/LocalLLaMA

The fastest place to learn what open models can actually run on your hardware.

r/coolgithubprojects

A steady stream of small open-source projects worth a look.

r/selfhosted

Free replacements for paid SaaS that you can run yourself.

Ollama

Run open language models locally with a single command.

ShareX

Powerful Windows capture tool: screenshots, scrolling capture, GIF and OCR.

Edit any GitHub repo in a browser IDE

Press `.` on any GitHub repository to open it in a full editor in the browser.

Phind

Answer engine tuned for programming questions, with sources.

AMFI NAV India

Official daily NAV for every mutual fund scheme in India, plain text.