CryptPad

CryptPad is an end-to-end encrypted, open-source collaborative office suite developed by XWiki SAS, a Paris-based company that has been building open-source collaboration software since 2004. It includes real-time editors for rich text, spreadsheets (powered by OnlyOffice), code, presentations, kanban, whiteboards and forms, with a personal encrypted Drive and team workspaces; the server cannot read user content. CryptPad is self-hostable for free under AGPL and also offered as CryptPad Cloud with paid plans. Development was bootstrapped via French BPI/EU research grants between 2015 and 2019.