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.

GNU Affero General Public License v3.0

DocumentServer

Free open source office suite with business productivity tools: document and project management, CRM, mail aggregator.

Apache License 2.0

CommunityServer

An office suite that combines text, spreadsheet and presentation editors allowing to create, view and edit local documents

DocumentServer

CommunityServer

DesktopEditors