Tiki Wiki CMS Groupware.

Open-source wiki-based groupware with built-in office and collaboration features

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Ashampoo Office
Duits kantoorpakket met tekstverwerking, spreadsheets en presentaties, Microsoft-formaat compatibel
DE · commercial
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CryptPad
French end-to-end encrypted collaborative office suite with documents, sheets, and presentations
FR · open-source
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EGroupware
German open-source groupware suite with CRM, project management, and collaboration tools
DE · open-source
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Etherpad
Open-source real-time collaborative text editor, widely deployed across European institutions
DE · open-source
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Grist
Open-source modern spreadsheet platform combining the power of databases with familiar spreadsheets
FR · open-source
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grommunio
Austrian open-source groupware and office suite as a Microsoft Exchange and Office alternative
AT · open-source
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Group-Office
Dutch open-source groupware with email, calendar, file sharing, and CRM modules
NL · open-source
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Horde
Open-source groupware framework providing webmail, calendar, and notes used by European providers
DE · open-source
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