Quattro Pro
Quattro Pro is a software originally developed by Borland. It is a spreadsheet program. The original Borland Quattro spreadsheet was a DOS program written in assembly language and Turbo C principally by Adam Bosworth, Chuck Batterman, and Lajos Frank.
Quattro Pro avoids Excel's long-standing worksheet size limitation of 65,536 rows by 256 columns, with a maximum worksheet size of one million rows by 18,276 columns. Quattro Pro is now sold by Corel, most often as part of Corel's WordPerfect Office.