Google Docs
docs.google.com
Several people typing in one document without overwriting each other
cryptpad.fr
Collaborative documents the server cannot read, with no account to start.
CryptPad runs rich text, spreadsheet, code, kanban and whiteboard editors where the decryption key lives in the URL fragment and never reaches the server, so the host stores content it cannot open. You can create a pad and share the link within seconds of arriving. Documents made without an account are deleted after three months of inactivity, and registered free storage is deliberately small.
Questions
Works the moment the page loads. No account, no email, no trial. Pads created without an account are deleted after three months of inactivity.
Yes. CryptPad sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Pads created without an account are deleted after three months of inactivity.
Alternatives
Same category or same task, ordered by how closely they overlap.
docs.google.com
Several people typing in one document without overwriting each other
when2meet.com
Paint your free hours on a grid and watch the group overlap darken
cal.com
Open-source scheduling links you can run on your own server
calendly.com
Send a link and let people book a slot your calendar says is free
doodle.com
Propose several times and let a group tick the ones that work for them
easyretro.io
Runs a retro as a board of cards people add, vote on and group