Apps to End-to-End Encryption

TorChat is a defunct decentralized anonymous instant messenger leveraging Tor hidden services for secure text communication and file sharing without central servers.

Rocket.Chat is a comprehensive free and open-source team communication platform, offering real-time chat, audio/video conferencing, screen sharing, and file sharing. Designed for flexibility, it can be self-hosted on-premises for maximum control and customization, making it ideal for organizations prioritizing data privacy and security.

Paperwork is an open-source, self-hosted alternative to popular note-taking and archiving applications like Evernote and OneNote. It offers a powerful suite of features for creating, organizing, and managing notes and documents with a strong emphasis on privacy and control.

Riot.im, now known as Element, is a secure, privacy-focused collaboration platform built on the open Matrix protocol. It enables real-time communication through chat, voice, and video calls, offering end-to-end encryption and bridging capabilities to connect with users on other networks like Slack, GitHub, and more.

Ring (SFLphone) is a free and open-source communication platform offering secure messaging, voice, and video calls. It leverages decentralization and end-to-end encryption for enhanced privacy across multiple operating systems including Linux, Windows, macOS, and Android.

Cozy is a personal cloud platform designed to give users control over their digital lives. Store, sync, and share your photos, files, contacts, and calendar in a private and secure environment. It offers a suite of integrated applications to manage your data.

Mattermost is an open-source, self-hosted platform for secure team collaboration, offering a Slack-alternative with emphasis on data control, privacy, and customizability. It provides a range of communication and project management tools for distributed and technical teams.

Psi is a robust, open-source instant messaging client built on the XMPP protocol. It's known for its focus on speed, efficiency, and adherence to XMPP standards, offering a clean interface and strong privacy features for secure and reliable communication.

RetroShare is a secure, decentralized, and open-source communication platform built on a friend-to-friend network, offering encrypted file sharing, serverless email, instant messaging, and forums.

Nextcloud is an open-source, self-hosted platform for file synchronization, sharing, and collaboration. It provides a private alternative to commercial cloud storage services, offering a comprehensive suite of tools including file management, calendar, contacts, and notes, all under your control.

Linphone is a free and open-source Voice over IP (VoIP) application and SIP client available on multiple platforms. It enables encrypted voice and video calls, instant messaging, and file sharing, offering a privacy-focused communication solution.

Pulse is a free and secure decentralized file synchronization engine developed by Ind.ie. Designed with privacy and control in mind, it allows users to synchronize files and folders directly between devices without relying on central servers, promoting data ownership and resilience. While discontinued, it represents an important effort towards decentralized file management.

Duplicati is a robust, free, and open-source backup client that securely stores encrypted, compressed, and incrementally updated backups on various cloud storage services, remote servers, or local drives. It's designed for both technical users and those who prefer a guided configuration.

Tutanota is a leading open-source email service offering robust end-to-end encryption and enhanced privacy. It provides a secure platform for communication and calendar management, accessible via web and dedicated applications.

Leanote is a versatile self-hosted note-taking application that blends rich text editing with Markdown support. It offers seamless synchronization across multiple devices and features built-in blog publishing capabilities, making it a powerful tool for both personal information management and content creation.

Firefox Sync seamlessly synchronizes your browsing data across all your devices running Firefox. Access tabs, bookmarks, history, passwords, and preferences from your desktop, laptop, or mobile phone, ensuring a consistent and personalized browsing experience wherever you go.

ONLYOFFICE is a powerful and secure office suite offering online document, spreadsheet, and presentation editors. It fosters collaboration with real-time co-editing and integrates seamlessly with various cloud storage services, providing a robust platform for both individual and team productivity.

ProtonMail is a leading secure email service utilizing end-to-end encryption and zero-access architecture to protect user privacy. Developed by scientists at CERN, it offers a robust and user-friendly platform for sending and receiving confidential communications.

Jitsi is a free and open-source suite of secure, flexible communication tools. It offers multi-platform support for voice (VoIP), video conferencing, and instant messaging, emphasizing privacy and ease of use with no account required to start a meeting.

Signal is a secure, open-source messaging application that uses end-to-end encryption to protect user communications. It offers text messaging, voice and video calls, group chats, and file sharing, all with a strong focus on privacy and security. Available on multiple platforms, Signal is a leading choice for individuals prioritizing confidential conversations.

Tox is a free, open-source, and secure peer-to-peer instant messaging and video calling protocol designed for strong privacy and censorship resistance. It provides end-to-end encrypted communications without reliance on central servers.

Adium is a free and open-source instant messaging client for macOS, designed to connect to multiple chat networks simultaneously. Supporting protocols like Jabber (XMPP), Google Talk, AOL Instant Messenger (AIM), ICQ, MSN Messenger, and Yahoo! Messenger, Adium provides a unified interface for all your conversations.

Matrix is an open network for secure, decentralized real-time communication. It provides a flexible protocol for developers to build collaborative applications like instant messaging, VoIP, and video conferencing, enabling seamless communication across different service providers.

Bitmessage is an open-source peer-to-peer encrypted messaging system designed to provide robust privacy and security. It operates without central servers, ensuring decentralized communication and offering anonymity by design. Ideal for those prioritizing secure and private digital interactions, it leverages strong encryption to protect messages from eavesdropping.