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Plan and share personal or professional events in an encrypted calendar across desktop and mobile apps.

Manage personal or team schedules in Proton’s privacy-focused calendar service.

A cross-platform calendar that combines weekly planning, meeting notes, and tasks.

A free Markdown notebook that stores notes as ordinary files and offers optional encrypted sync.

Manage calendar events, tasks, time zones, and meeting invitations from Apple devices.

A local-first Markdown note app with an optional self-hosted encrypted sync server.

Manage several encrypted-folder backends from a desktop interface

A maintained Thunderbird fork with encrypted-message search

Embed calendar connections, availability checks, and event writing in a software product.

A private, open-source writing app built around searchable notes, pins, and trails.

Local Markdown notebooks with backlinks, search, and optional self-hosted encrypted sync.

End-to-end encrypted messaging, voice, video, and file sharing for organizations.

An open-source handwriting notebook with nested folders and encrypted cross-device sync.

A task planner that turns priorities into calendar time blocks and a daily plan.

Read calendars and create or update events through Google Calendar's REST API.

Calendar-based time tracking that turns events into categorized reports and project timesheets.

Manage personal events, team calendars, appointments, and shared resources in one online calendar.

Schedule events and share calendars for personal or organizational use.

Keep encrypted workplace messaging on a self-hosted XMPP server.

AI-native Markdown notes with encrypted sync for developers

Share a configurable calendar with role-based access and multiple views.

Manage calendar events and tasks in BusyCal across Mac and iPhone.

OpenPGP mailboxes bundled with encrypted file storage

Configurable browser with blocking and encrypted sync