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

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

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

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

AI-native Markdown notes with encrypted sync for developers

Configurable browser with blocking and encrypted sync

A Markdown notes app with wikilinks, graph views, offline work, and free encrypted sync.

A local-first desktop notebook that stores Markdown notes and canvases on the user’s computer.

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

Keep a working folder and an encrypted folder in sync

Manage several encrypted-folder backends from a desktop interface

A maintained Thunderbird fork with encrypted-message search

Search shell history with command context, and optionally sync it across machines with encryption.

A handwriting notebook with on-device encryption and optional sync to storage you choose.

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.

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

OpenPGP mailboxes bundled with encrypted file storage

Browse compatible encrypted filesystems inside Android

Encrypted IPv6 overlay with public-key-derived addressing

Open source, end-to-end encrypted note taking app for Windows, macOS, Linux, Android, iOS and the web.

A local-first personal knowledge workspace for private notes, linked objects, and databases.

Store notes and files in an encrypted notebook that syncs across devices.

A configurable proxy for encrypted DNS protocols