CryptPad is a browser-based collaboration suite. According to its developers, document content is encrypted in the browser before synchronization, and several people can work together in real time. You can choose a public instance or host it yourself. 1
Who it suits
Collaborating on documents with encryption built into the service.
Before you choose
You still trust the instance operator to serve the correct application code. Its security guide says the operator can see connection metadata such as your IP address. 2
Licence: AGPL-3.0-or-later 1