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A maintained Thunderbird fork with encrypted-message search

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

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

Manage several encrypted-folder backends from a desktop interface

OpenPGP mailboxes bundled with encrypted file storage

Encrypted correspondence alongside existing Gmail or Outlook accounts

Activist email with encrypted storage and recovery-code requirements

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.

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

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.

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

AI-native Markdown notes with encrypted sync for developers

Device-side encrypted email with identity-verification options

A command-line mail client that accepts prepared encrypted messages

Configurable browser with blocking and encrypted sync

Browse compatible encrypted filesystems inside Android

Encrypted IPv6 overlay with public-key-derived addressing

Keep a working folder and an encrypted folder in sync

A configurable proxy for encrypted DNS protocols

Hosted mail with aliases and a key-encrypted webmail copy

Encrypted attachments and messages within Outlook and Gmail

Encrypted mail hosting with aliases and mailbox-import tools