Casual Sheets

Self-hosted collaborative spreadsheet with .xlsx round-trip editing

Webfreeglobal

Casual Sheets is an open-source, self-hosted web spreadsheet with real-time co-editing and round-trip .xlsx compatibility, positioned as an alternative to Google Sheets, Excel Online, and OnlyOffice that teams can run on their own server. It supports CSV and ODS import/export, pivot tables, and sparklines.

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