An open source software suite that can be downloaded for free, LibreOffice features an Excel alternative named Calc which supports XLS and XLSX files as well as the OpenDocument format.
Ihe nwere ike ịbudata maka free, LibreOffice na-akọwa ihe ọzọ Excel nke a na-akpọ Calc nke na-akwado XLS na XLSX faịlụ yana ọkwa OpenDocument.