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Sandstorm
Sandstorm is a self-hostable web productivity suite. It's implemented as a security-hardened web app package manager.
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ONLYOFFICE
ONLYOFFICE Docs is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets and presentations, forms and PDF, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time.
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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
Haven't used this myself, but a self-hosted version of google docs, drive, sheets, etc exists: https://sandstorm.io/
There's OnlyOffice though I can't vouch for its quality as a multi-user docs / sheets replacement; I've only used it offline.