Spreadsheets created with Calc are saved with an ".ods" file extension. They contain data stored in cells, which are stored in tables. Data within each cell may be entered manually or can be computed using a formula.
About Mariner Calc
Mariner Calc is a spreadsheet application developed for Mac OS X. It is designed to be lightweight and uses less memory and disk space than other similar spreadsheet programs. Calc includes over 100 built-in functions, and supports charts, split window panes, and protected worksheets. It is available as a standalone product or with Mariner Write as part of the MarinerPak.