Tad is described as 'Fast CSV file viewer for analyzing tabular data'. There are seven alternatives to Tad for Windows, Mac and Linux. The best alternative is CSVFileView, which is free. Other great apps like Tad are CSVboard (Free), Modern CSV (Paid), CSV Quick Viewer (Free, Open Source) and Comma Chameleon (Free, Open Source).
CSVFileView is a simple CSV file viewer/converter utility that allows you to easily view the content of CSV or tab-delimited file created by NirSoft utilities or by any other software, in a simple table viewer.
CSVboard is an application for viewing, sorting and finding data from a csv file. Open your csv files with minimum effort. Clean and simple Look. Free for private and commercial use. Source code available at Github.