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Modern CSV - A CSV editor/viewer
jq - jq is like sed for JSON data - you can use it to slice and filter and map and transform structured...
CSVpad - CSVpad is a handy free CSV (Comma-separated values) editor.
fx - Command-line JSON processing tool
Rons CSV Editor - Rons CSV Editor / Now Rons Data Edit
jello - jello is a command line tool that filters JSON data using pure python syntax.