Add advanced spreadsheet capababilities to your applications. Perform calculations, reference cells with relative and absolute addressing, perform formatting, handle multiple worksheets.
Solution Center - Code examples using Spreadsheet Components
 How can I create an MS Excel compatible spreadsheet file from my app without running Excel?
 How to read data from XLS, XLSX or CSV files without the need for MS Excel?
 How to programatically manipulate the contents of an MS Excel spreadsheet
 Can I use a spreadsheet to perform calculations and get the results back in my application?

ActiveX Spreadsheet Components by FarPoint Technologies, Inc.

Spread V7.0

Use FarPoint's Spread 7 to easily incorporate advanced grid and high-level spreadsheet features into your applications. You get unmatched flexibility at the cell level for maximum control over the display and entry of the data, plenty of events to respond to user changes and an impressive feature list for everything in between; including import/export capabilities, enhanced printing, 14 cell types, formulas, plus many more features you'd expect from the market-leading component.

ActiveX Spreadsheet Components by Pagos, Inc.

Pagos Spreadsheet Component (PSC) for COM V4.5

Convert your spreadsheet applications into enterprise solutions. Using Pagos Spreadsheet Component you can connect existing Excel spreadsheets into your Web-based application. Pagos Spreadsheet Component interprets the formulas and data in Excel by turning them into high performance calculations engines. As a result you don’t have to understand and rewrite complex calculations or business logic already built into your Excel files.

ActiveX Spreadsheet Components by SM Software

OLE XLSFile V4.0 -  OLE XLSFile is an ActiveX library for reading and writing of Microsoft Excel XLS files. It is based on direct reading and writing of files, and works without OLE Automation with Microsoft Excel. You can use it with any development tool which supports COM objects (VB, C++, etc.). Borland Delphi developers may use TXLSFile Delphi Library.