ONLYOFFICE DocSpace — #5 Alternative to Google Workspace
High-fidelity DOCX, XLSX, and PPTX collaborative editors for cloud or on-prem
Uses OOXML natively as its core format so complex Word and Excel layouts render identically across browser co-editing and desktop apps.
License: AGPL-3.0 · Pricing: Open Core · Compare all Google Workspace alternatives · Official Website