Numbers crashed on my 3.2 GB university export, so I built BigCSV. It memory-maps the file instead of reading it into RAM, so a multi-gigabyte CSV is on screen about as fast as you can double-click it. Scroll, search and sort every row without a terminal. Free with no row limits and no nag screens. Filter, column stats and export to Excel unlock once for €9.99 (about $10.80). One-time purchase, never a subscription. Nothing leaves your Mac.
