Self-hostable software: Calendar And Contacts (41)

An open-source CRM for managing customer data, permissions, workflows, emails, and related records.

Cal.com is an open-source scheduling platform and Calendly alternative for booking and managing events.

Nextcloud Server is a self-hosted platform for storing, syncing, and sharing files, contacts, calendars, and other data.

Monica is an open-source personal relationship management web application for documenting life and organizing interactions with family and friends.

A one-click, easy-to-deploy mail server appliance for self-hosting email on Ubuntu.

Stalwart is an open-source mail and collaboration server with support for IMAP, JMAP, SMTP, CalDAV, CardDAV, and WebDAV.

ownCloud Core is a self-hosted file sharing and collaboration platform for storing, syncing, and sharing files, calendars, contacts, and other data.

Roundcube Webmail is a browser-based multilingual IMAP client with an application-like user interface.

Radicale is a CalDAV and CardDAV server for calendars, to-do lists, and contacts.

Easy!Appointments is a self-hosted appointment scheduler for booking customers with businesses through a web interface.

A backend for a personal management system that helps organize private data such as notes, contacts, passwords, schedules, payments, files, and reports.

Modoboa is a mail hosting and management platform with a web user interface, administration panel, and webmail.