Collabora Online is an open source document collaboration service. It can be self-hosted and is used by many cloud solutions like Nextcloud Office. They offer a text (Writer), spreadsheet (Calc), presentation (Impress) and vector graphics (Draw) editor.
ONLYOFFICE is a document collaboration service from Latvia. They offer integrations for several services like SharePoint and Jira as well as self-hosted Cloud services like ownCloud and Nextcloud.
ONLYOFFICE is open source and developed by Ascensio System SIO, headquartered in Riga, Latvia. OnlyOffice is delivered as a SaaS solution or as an installation for private network deployment. They also offer a white label solution.
Nuclino is a collaborative document editing service from Germany.
Nextcloud Office is the document collaboration service of the Nextcloud suite. Nextcloud is a open source file hosting service for self-hosting. Nextcloud Office is part of the Nextcloud suite and is based on the open source tool Collabora Online.
CryptPad is an open source document collaboration service that can be self-hosted. CryptPad is zero-knowledge, which means that the operator cannot read the content written on the site. Since it can be self-hosted there are many instances. The most known, which is also driven by the main developers however is cryptpad.fr.
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