VisiData is an interactive tool for tabular data in the terminal. It combines the clarity of a spreadsheet with the speed of the command line and the power of Python. You open files such as CSV, TSV, Excel, JSON, SQLite and log files, explore them with histograms and scatter plots, sort and edit the data, and record steps to replay them later or run them in batch mode. It is aimed at analysts, developers and administrators.
VisiData is free software under the GPL (version 3). The copyright is held by the lead developer, whose public profile lists the United States; no company or foundation is named. Paid plans fund ongoing development. The program runs locally, so your data stays on your own system. According to its privacy policy, VisiData does fetch one small file of start-up messages from the project website once a day, and the server log records details such as the IP address. You can switch that request off with a setting.