Knowledge & Open Data

Open-Meteo is a free, open-source weather API with no API key required. Provides hourly and daily forecasts, historical data, and climate projections using multiple weather models.

The Internet Archive

United States ham radio callsigns

Colorado State Government Open Data

The Daily Journal of the United States Government

Access millions of museum specimens from organizations around the world

Integrated Taxonomic Information System

Weather and climate data

Extract structured data from any website

NASA data, including imagery

Australian Government Open Data

Belgium Government Open Data

Italy Government Open Data

New Zealand Government Open Data

Poland Government Open Data

Taiwan Government Open Data

United States Government Open Data

Find Canadian Government Representatives

Company, vehicle, launchpad and launch data

Sunset and sunrise times for a given latitude and longitude

The Official Carbon Intensity API for Great Britain developed by National Grid

University names, countries and domains

US federal spending data

Water quality and level info for rivers and lakes

USA patent api services

Weather, especially for Astroweather

Asterank.com Information

Weather and weather webcams

Canadian Government Open Data

Romania Government Open Data

ISS astronauts, current location, etc

Multiple astronomy data sources

Information about Germany's federal highways like construction sites and traffic jams

NOAA aviation weather forecasts and observations

Brazil Central Bank Open Data

Consult companies by CNPJ for Brazilian companies

Provides legislative information in Apis XML and JSON, as well as files in various formats

Berlin(DE) City Open Data

Bologna(IT) City Open Data

Gdańsk (PL) City Open Data

Helsinki(FI) City Open Data

Lviv(UA) City Open Data

New York (US) City Open Data

Toronto (CA) City Open Data

API calculates and validates the carbon footprint

Data on higher education institutions in the United States

Open energy data from Energinet to society

US Public Data

API of the German Weather Service (DWD): weather data, data from specific weather stations, warnings (local, coast, sea, alps)

Access information on the FBI Wanted program

Information of fruit trees of the world

High Energy Physics info. system

Check if a number is even

ISRO Space Crafts Information

Data sets from the İstanbul Metropolitan Municipality (İBB)

Upcoming Space Launches

Spaceflight launches and events database

Get measure resources and influence to rank the relative power of states in Asia

Predicted and actual air quality components for The Netherlands (RIVM)

Weather forecasts and alerts from the US National Weather Service

Used to fetch the specific details about a country

Symbolic and Arithmetic Math Calculator

Symbolic and Arithmetic Math Calculator

Open data about nobel prizes and events

REST API used to access NoctuaSky features

Spatial (GIS) and non-spatial city data for Minneapolis

Australian Capital Territory Open Data

Argentina Government Open Data

Austria Government Open Data

Cyprus Government Open Data

Czech Republic Government Open Data

Denmark Government Open Data

Finland Government Open Data

Germany Government Open Data

Ireland Government Open Data

Lithuania Government Open Data

Mexican Statistical Government Open Data

Mexico Government Open Data

Netherlands Government Open Data

Peru Government Open Data

Portugal Government Open Data

Queensland Government Open Data

Slovakia Government Open Data

Slovenia Government Open Data

South Australian Government Open Data

Spain Government Open Data

Sweden Government Open Data

Switzerland Government Open Data

UK Government Open Data

Victoria State Government Open Data

West Australia Open Data

Large datasets repository of African open data

Data on international sanctions, crime and politically exposed persons

Data from Personal Weather Stations called senseBoxes

API is intended to explore and visualize trends/patterns across the US innovation landscape

Open low-cost PM2.5 sensor data

Real Time Air Quality Monitoring

Stock Market Data

Radar data collected from different websites across the Internet

Decodes base64 encoding and parses it to return a solution to the calculation in JSON

With this API you can add each of the times introduced in the array sended

Satellite information

Open data of the city Umeå in northen Sweden

Unit converter for standard and uncommon units

US National Weather Service

A RESTful free API to check the weather

API to estimate the carbon footprint of loading web pages

Weather

Air Quality Index Data for over 1000 cities

US Government Data

This API provides read access to DIP entities (e.g. activities, persons, printed material)

Broadest collection of public data

Information on campaign donations in federal elections

Get JSON formatted summary with title, description and preview image for any requested URL

Number of the day, random number generation, number facts and anything else you want to do with numbers

French Government Open Data

Indian Government Open Data

Open air quality data

Data on corporate entities and directors in many countries

Real-time UV Index Forecast

Weather

Energy production photovoltaic (PV) energy systems

Recreational areas, federal lands, historic sites, museums, and other attractions/resources(US)

Global marine weather from multiple sources

More than 1.5 million barcode numbers from all around the world

US government job board

Weather

Access to the laws of British Columbia

Access to the laws of British Columbia

Gdynia (PL) City Open Data

Contains live datasets including information about petitions, bills, MP votes, attendance and more

Green Power Index for Germany (Grünstromindex/GSI)

Facts about numbers

Colombia Government Open Data

The largest set of publicly available real time urban data in the UK

Weather, for Japan

Content Curation Service

Weather and forecast data from Spain

Air quality and weather data

Natural Disasters API

API to calculate carbon (C02) emissions estimates for common C02 emitting activities

Boston(US) City Open Data

Nantes(FR) City Open Data

Nantes(FR) City Open Data

Calculate the environmental footprint created by a broad range of emission-generating activities

Weather

Current International Affairs, quizzes and more

Meteorological data of the Basque Country

Weather

UK official public record API

Federal Statistical Office Germany

Provides weather forecast data for cities in Brazil

Air quality and weather data

People groups of the world with the fewest followers of Christ

Curated experimental data for materials science

Global weather data with 100+ weather variables, 14 days ahead and 4 days of history data.

NASA Astrophysics Data System

Stock market data

Data from the US National Park Service

Weather and climate data

70+ years of global, hourly historical and forecast weather data from NOAA and ECMWF

Greece Government Open Data

Luxembourgish Government Open Data

New South Wales Government Open Data

Thailand Government Open Data

Canadian political financing, lobbying registrations and communications

Events and natural disasters data

Canadian federal procurement contracts, tenders and awards

Location-based weather data

All types of disaster data

Hourly usage energy report for Srp customers

Weather forecasts & historical data from the world’s most trusted meteorological institutions in one single API

Weather API Powered by Proprietary Technology

UK Companies House Data from the UK government

Global historical and weather forecast data

Humidity & Air & Pressure API

Assesses weather condition in specific locations

Community driven API for Brazil Public Data

Weather and forecast data

A collection of the best open data sets and open-source tools for data science.

Tomorrow.io's Weather API delivers hyper-local, minute-by-minute forecasts with 100+ weather data layers including precipitation, wind, air quality, and pollen. Formerly ClimaCell.