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SimpleSpread is a native, open-source Mac spreadsheet app written entirely in Swift, offering fast loading of CSV/XLSX files, 156 functions, incremental recalculation, and Excel-style keyboard editing under the MIT license.
Extend UI is an open-source UI kit for modern document apps, providing viewers for PDF, DOCX, XLSX, and CSV files, along with features like bounding box citations, file upload, and e-signing.
Extend UI is an open-source library of 14 UI components for document agents, including viewers for PDF, DOCX, XLSX, with features like bounding box citations, file upload, and e-signature. It is MIT licensed and available on the shadcn component registry.