VisiData is an interactive multitool for tabular data. It combines the clarity of a spreadsheet, the efficiency of the terminal, and the power of Python, into a lightweight utility which can handle millions of rows with ease.
Accepts many different data sources, from CSV files to PCAPs to HTML5 pages as long as you have the right Python modules installed. Analyzes and plots the data in a text terminal so you can explore it. Takes some playing around to learn how to use it.