Spread.NET 6.0

Spread.NET is the most popular Microsoft® Excel®-compatible spreadsheet components for .NET Windows Forms and ASP.NET development.
Spread.NET is the combination of Spread for Windows Forms and Spread for ASP.NET provided as a single, multi-platform toolkit.
Whether developing client applications, web sites, or web applications, the mission of Spread is to allow developers to embed complete spreadsheet functionality into applications to empower users - without requiring Microsoft Excel.
Through built-in support for Excel document import and export, Spread allows you to apply complete programmatic control of user interactions with data in Excel documents - allowing you to maintain business rules, security, and data integrity.