Datatables with the jEditable plugin.

  Datatables - http://datatables.net/

  jEditable - http://www.appelsiini.net/projects/jeditable

  How to integrate - http://datatables.net/release-datatables/examples/api/editable.html

There is also Dan Bricklin's socialcalc https://github.com/DanBricklin/socialcalc which has some relatively active forks including audreyt's ethercalc https://github.com/audreyt/ethercalc

You can see what the spreadsheets look like at http://www.ethercalc.org/

For just viewing and editing spreadsheets without social features, you can ignore the servers included, the javascript widget works just fine by itself.

Dan Bricklin co-authored VisiCalc, the first spreadsheet program for the masses.

DataTables ( http://datatables.net ) has some overlapping functionality, some of which is provided by plug-ins. For example KeyTable + Editor: http://editor.datatables.net/tutorials/keytable .

*Disclaimer - I am the author of DataTables.

I've been looking for something like this for a while to provide copy / paste address book import functionality from Excel or any spreadsheet program. Google Apps script was interesting because you could do complex rules like adding validation but I don't think it's really designed to be dropped in to your site to be used by anonymous users and having Google Spreadsheets as a dependency isn't ideal.

However, for simple input this looks great. What else is out there? I saw the projects listed on this project's github but those weren't the same - just start editing and pasting.

A data explorer, designed to be highly flexible: http://reclinejs.com