CryptPad
self-hosted, office suites

CryptPad is a secure and open-source collaboration platform designed to protect user privacy through end-to-end encryption. It offers a suite of tools for real-time collaboration on documents, spreadsheets, presentations, and more. All data is encrypted client-side before being sent to the server, ensuring that only the authorized users have access to the content. CryptPad enables seamless collaboration by synchronizing changes made by multiple users in real-time, allowing teams to work together on projects while keeping their data safe and private.