NatsuLiphone, a favored iPhone Twitter client, has been revealed to be open source and is available on GitHub, offering an opportunity for those interested in iPhone development and Twitter to explore its code. The application can be accessed on GitHub at the repository managed by takuma104, allowing developers to delve into its structure and functionality. This discovery was shared by Tom Preston-Werner, known by his handle @mojombo, who encourages individuals to take the time to investigate the code for potential insights and learning opportunities.