If you regularly work with CSV files and live in the terminal, this is a surprisingly complete spreadsheet TUI with vim keybindings. You get proper navigation (gg, G, marks, jump lists), visual selection for ranges, formulas, undo/redo, and command mode for saving and opening files. The non-interactive mode is clever: you can read specific cells or ranges in scripts (sheets budget.csv B9) or set values directly (sheets data.csv B7=10 B8=20) without opening the TUI at all. It's written in Go by maaslalani and honestly feels more polished than you'd expect from a terminal spreadsheet tool. Beats piping to awk when you need to quickly edit structured data without leaving your workflow.
npx skills add https://github.com/aradotso/trending-skills --skill sheets-terminal-spreadsheet