List of interesting free-public APIs, for your projects or for your work! (not really, nobody could use these APIs on its work XD...)

APIs.txt

// Chuck Norris Facts
https://api.chucknorris.io/

// Pokemon data
https://pokeapi.co/

// Tracking of the International Space Station
http://open-notify.org/Open-Notify-API/ISS-Location-Now/

// Incredible NASA API (needs registration)
https://api.nasa.gov/index.html

// Star Wars API (nothing else to say)
https://swapi.co/

// Song's lyrics (needs registration)
https://developer.musixmatch.com/documentation

// Translations to Dothraki, Minion, Klingon! and more
http://funtranslations.com/api

// Beer information (plans + registration)
https://www.brewerydb.com/developers

// Marvel's World (registration)
https://developer.marvel.com/documentation/getting_started

// Trivia time! (more than 150k questions)
http://jservice.io/

// Anime world
https://kitsu.docs.apiary.io/#introduction/json-api/request-headers

// Countries information
https://restcountries.eu/

// Quotes of Donald Trump
https://docs.tronalddump.io/

// Cat facts 
https://alexwohlbruck.github.io/cat-facts/

// Advice generator
http://api.adviceslip.com/

// Data about anime
http://wiki.anidb.net/w/API

// Progress of COVID-19
https://api-sports.io/documentation/covid-19

// for a serious work please refer https://public-apis.xyz/