ONLYOFFICE Server is a free collaborative online office suite comprising viewers and editors for texts, spreadsheets and presentations, fully compatible with Office Open XML formats: .docx, .xlsx, .pptx and enabling collaborative editing in real time.
Install OnlyOffice Server in a different domain than the one used by Nextcloud:
https://domain.org/nextcloud (for example)
Install ONLYOFFICE connector in Nextcloud
https://domain.org/nextcloud/settings/admin/onlyoffice), enter your OnlyOffice Server address (for example:
OnlyOffice Server is now connected to Nextcloud.
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