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IronCalc makes powerful spreadsheets possible, without Microsoft or Google

IronCalc brings fast, Excel-compatible spreadsheets to your browser without locking you into Microsoft 365 or Google’s cloud.
GitHub

Create Excel file from JSON/YAML based template

Generate styled Excel files from JSON or YAML files. Includes a Handlebars template engine for dynamic content. Insert CSV or TSV tables from files: Auto-filter with specified filter values. Set cell ...