Flow

Self-hostable, feature-rich event, group, and time management system

Androidfreeglobal

Flow is a free, open-source time and event management system that lets users choose where their data is stored and who can access it, grouping events and managing places and people across Windows, Linux, Android, and web. It's still in active development and not yet production-ready, but offers a full feature set for people who want event scheduling under their own control.

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