A free program for Android, by OffiDocs Mobile Apps.

With AndroCalc, you can easily edit and manage Excel documents. It supports different formats, including XLS, XLSX, and ODZ. You can add headers, footers, and even sheet names. AndroCalc is designed to work with multiple documents at once. You can easily edit the data and make changes to the layout and formatting of the spreadsheet. You can add or remove columns and rows and even change the number of columns in a spreadsheet. You can also add blank cells and empty tables and columns and even delete whole sheets. You can do all of this without having to save your work as a new file.

To use AndroCalc, you just need to install it on your device.