LibreOffice - Calc - LibreOffice Calc is the spreadsheet program you've always needed. A fork of OpenOffice.
Modern CSV - A CSV editor/viewer
Microsoft Office Excel - Microsoft Office Excel is a commercial spreadsheet application.
Rons CSV Editor - Rons CSV Editor / Now Rons Data Edit
LibreOffice - Free office suite, open source, and compatible with .doc, .docx, .xls, .xlsx, .ppt, .pptx files. Updated regularly – download for free. Originally based on OpenOffice.org.
Tablecruncher - This lightweight, yet powerful CSV editor for Apple Mac helps you crunch all your tabular data.