Public API's
Science
NASA Open API's
Open Notify Space Station API's
Astronomy API
uBio Biological Namebank API
Enrichr Gene Database API
Health
USDA Food Composition Databases
Yummly Recipe and Food API
Habitica Gamification API
Linguistics
Dictionary API
WordNik API
Word Cloud API
Fun/Miscellaneous
Game of Thrones API
Pokeapi Pokemon API
Trivia Database API
Star Wars API
Deck of Cards API
IGDB Video Game Data API
Data.gov Datasets