Open Source #calendar Projects

A self-hosted calendar and task planner in one, with two-way CalDAV, Google Calendar, and Apple Calendar sync.

Free, open source CRM for managing leads, contacts, sales pipelines, email campaigns, and customer support on your own servers.

Self-hosted personal CRM for tracking contacts, relationships, birthdays, and reminders, built with Go and React.

A fast, self-hostable scheduling platform written in Rust, like Cal.com but without Node.js or a database server.

Open-source event calendar and ticketing platform with no platform fees on ticket sales.

Self-hosted, offline-first productivity app combining tasks, habits, a Pomodoro focus timer, and calendar with optional WebDAV sync.

Self-hosted subscription tracker with timezone-aware reminders, budgets, spending insights, and ten notification channels.

Open-source to-do list and time tracker with timeboxing, a daily planner, Pomodoro focus sessions, and integrations for Jira, GitHub, and GitLab.

Self-hosted, open-source task manager with lists, kanban boards, Gantt charts, reminders, and CalDAV — a free alternative to Todoist.

Self-hosted shift management for teams: unlimited calendars, one-click shifts, sharing, external calendar sync, and ICS/PDF export.