CSVera is a planning and estimating tool, disguised as an in-browser CSV editor. Advantages:

• No server is required
• The underlying data is still a checked-in CSV
• You can display it read-only from a CI server, e.g. TeamCity
• It doesn't really care what columns you have, so long as there is a header row

• Download the Complete Zip. To change versions, just grab the latest copy of csvera.js
• Modify the <table> in CSVera.html so that the csv attribute points to your own CSV file. This should have a header row.

• Open CSVera.html in your favourite browser (Chrome)
• Click rows to select them. Use the arrow keys to move them up and down. CTRL-d (or CMD-d) to duplicate the row.
• Click column headings to activate filters.
• Use CTRL-a then CTRL-c to copy the contents back to the original file (or CMD-a and CMD-c)

Google Chrome sucks a bit when it comes to security overkill. It won't let one local file AJAX-load another, since file:/// URLs don't have any origin, therefore violate the same origin policy, even when they have the same origin. The workaround is to start Chrome with this check disabled.

Mac:

/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --allow-file-access-from-files

Windows:

"C:\Documents and Settings\username\Local Settings\Application Data\Google\Chrome\Application\chrome.exe"   --allow-file-access-from-files

Go to about:config (type it in the address bar) and set security.fileuri.strict_origin_policy to false

Versions less than IE 9 are aggressively unsupported. IE 9 is just untested.

CSVera does not yet do:

• Saving back to the original file. Javascript isn't allowed to do this. The workarounds are hideous. I might do one later.
• Column-click sorting