CSView is a free, open-source, cross-platform, fast, and lightweight CSV viewer for large files.
With copy and paste functionality and selectable delimiter support, CSView provides a quick, clean, and straightforward way to access huge CSV files. As soon as you open a large file, it will display the data immediately. The program can open larger files than 4 GB in size. Currently, the program is available for the 64-bit versions of macOS and Windows.