Two line element set - orbital perturbation data sets published by North American Aerospace Defense Command are periodically updated and published in JSON format over REST API.
Airport Information
Information including METAR which is currently available for following airports in near real time.
Active Fire Data - Europe
Near real time updates of detected active fires over Europe. Active fire products are obtained from NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) and NASA's Visible Infrared Imaging Radiometer Suite (VIIRS)
Meteorological Terminal Air Report METAR - Aviation weather report updated every 30 minutes currently available for limited number of airports.
Apollo JSON
Data repository contains JSON documents of data from NASA Apollo missions. Data ranges from orbital parameters to food and medicine carried to each mission. Every dataset is obtained from Apollo By Numbers and structured in JSON format.