NativeExcel does not require installed Microsoft Office, it writes and reads excel files directly.
NativeExcel can be used as a replacement of standard Excel components, it has the same object model, properties and methods.
With NativeExcel v3.x you can open and modify an existing spreadsheet.
NativeExcel works with Delphi 4, 5, 6, 7, 2005, 2006, 2007, 2009, 2010, XE, XE2, XE3 and XE4.

Important notice
The current implementation for XLSX file format has some temporary limitations
The following features are not supported:
Any kind of graphic objects (images, notes, graphs, buttons etc.)
External references in formulas (references to external workbooks)
Data validation
Autofilters

Advantages
High performance (30000-40000 values per second)
Open an existing spreadsheet feature
Convenient object model
Support for all Excel formatting options
Microsoft Office is not required
Compatibility with standard Delphi's Excel components
TDataset2Excel component. Populates a spreadsheet from TDataset descendants
TDBGrid2Excel component. Populates a spreadsheet from TDBGrid descendants

Features
Support for XLSX file format (Excel 2007/2010 file format).
Open an existing excel file
Access any cell values (number, string, date, boolean, formula)
Calculation engine to perform computation on the cells
Cell attributes (alignment, orientation, comments, borders, background attributes, and so on)
Font attributes (font name, font size, color, decoration, and so on)
Images
Merged cells
Group/UnGroup rows/columns
Unicode characters support
Copy/Move/Delete/Insert range of cells
Reading of password protected (encrypted) excel files
Worksheet attributes (name, protection, selection, outline, and so on)
Printing attributes (page size, orientation, margins, footer, header, page breaks, and so on)
Exporting workbooks and worksheets to HTML or RTF files

Only for V.I.P