Eventra

Eventra is a comprehensive event management system that empowers organizers to create, manage, and track events seamlessly. Built with a modern tech stack featuring React frontend and Spring Boot backend, Eventra provides everything needed to run successful events from creation to post-event analytics. Maintained by SandeepVashishtha on GitHub, where it has earned 146 stars from the community.

It's actively developed around gssoc25, collaborate, gssoc, and is a solid reference for anyone building with these tools.