OpenSlides

OpenSlides helps organizations manage the entire lifecycle of meetings, from agenda creation to voting and minute publishing. It handles participant management, access control, and real-time collaboration during sessions. The platform supports both digital and hybrid formats, making it useful for associations, boards, and political bodies.

Key features include automatic agenda generation, electronic voting with multiple methods (open, secret, weighted), and a built-in document system for motions and amendments. It runs as a web application on any modern browser, with a Docker-based deployment option. OpenSlides integrates with LDAP and can sync participant data from external sources.

While not a billing tool itself, its workflow automation can integrate with payment systems for event registration fees. The open-source AGPL license allows self-hosting, and the company provides a hosted cloud version. It is widely used in German-speaking countries for political and organizational meetings.