Microsoft SharePoint, Microsoft Exchange Server, Zimbra Collaboration Suite, Zoho Mail, WikiSuite, CryptPad, Axigen, Wimi, SpreadsheetWeb, Nextcloud Hub, Kopano, Mercury Mail Transport System, IceWarp, Atmail Email Server, Samepage, CrossBox, Contactoffice, Linchpin, WEBCON Business Process Suite, GMX Online Office, Pawnmail, Flaskmail, Expanding Communication, Alinto, SMBMail, Sanwhole Exchange, HyperOffice Collaboration Suite, LeaderSend, Brilliance File Organizer, Centralpoint, OfficeNetPoint, Vcorreio, Emgage Prime, Zoho Workplace, HyperOffice Email Service, MailShogun are some alternatives to Google Workspace.