Hacktoberfest is an annual celebration of open source that takes place in October and is organized by DigitalOcean. It brings together thousands of people from around the globe to contribute to open source projects, collaborate with others, and learn about new technologies. The event provides various ways for people of all skill levels to get involved, including preparing and sharing open source projects, contributing to existing projects through pull/merge requests, mentoring others, donating money to open-source projects, and more. Companies like Intuit and GitHub are also participating in Hacktoberfest, highlighting the importance of open source collaboration and community engagement. This year's event is celebrating its 10th anniversary and features a variety of open-source projects and initiatives that participants can contribute to, such as Amplication, Appwrite, ILLA Cloud, Runme, and more. The event also includes a series of events, giveaways, and rewards for contributors, making it an exciting opportunity for developers to get involved and make a difference in the open source community.