A spreadsheet program that sucks less:

• Support for custom number of rows and columns. (LO, sc-im)
• Vim as a spreadsheet editor: Filter view
• Issue commands by typing: Styling commands
• Easily imports from other formats: html, MediaWiki
• Reorder rows and columns
• Alternative cell colors support
• Clip cell wrapping

Commandline implementation

Filter views

Possible filter implementation: Say you got dates and comments of the following files: buy.tsv, sell.tsv, rent.tsv. Then

1cat buy.tsv sell.tsv rent.tsv | sort

Browsing each .tsv file is the equivalent of filter view. The combined output is the default view.

Problem is: how to map it back? Map it back by appending the SHA1 hash of every line (+ fname, line no., etc.) to its beginning. That will make mapping easier and less error prone.