The article highlights eight free-to-use GraphQL APIs that developers can use for their projects and demos. These APIs include Space X API, SWAPI (Star Wars API), Rick and Morty API, Countries API, PokeAPI, DexAPI, Anilist API, and GitHub API. Each API provides a unique set of features and data, allowing developers to test and learn about GraphQL in a real-world context. The article includes example queries for each API to get started with using them. Some APIs are free for non-commercial use and have rate limits, while others require authorization headers or personal access tokens. The GitHub API is particularly notable for its support of both queries and mutations, making it suitable for building more in-depth examples and demos.