Hacktoberfest saw significant developer contributions to Nylas, with nine developers collectively providing over 3,500 lines of code in JavaScript, Python, and Java, showcasing various ways to utilize Nylas APIs for accessing and managing Calendar, Contacts, and Emails. Developers like Souvik Dey, Amit Kumar Sharma, and others created code samples demonstrating features such as searching emails, managing contacts, and creating calendar events. The event highlighted the benefits of open-source contributions, offering developers a chance to learn new APIs, explore different programming languages, and enhance their public profiles while providing Nylas insight into user interactions with their APIs to improve developer experiences. The Nylas Samples code repository continues to encourage ongoing contributions, fostering a collaborative environment for building with Nylas.