CSView is a lightweight viewer that displays the start of a data file immediately so there's no waiting around for very large files to load. Using very little memory CSView can comfortably open files larger than 4GB.
With copy and paste functionality and selectable delimiter support CSView provides a fast, clean and simple way to access very large CSV files.
Updated June 2019 - Version 1.3.3 has a number of bugfixes: high-DPI rendering is fixed on Windows, and CSV files with empty columns no longer cause alignment problems.
Updated April 2019 - Version 1.3 now supports searching in files, high-DPI display resolutions and has improved rendering on MacOS Mojave.