Ask HN: Does a self hosted Google Spreadsheet like tool exist for NASA?

NASA/JPL's engineering data is heavily regulated and it's not legal to store our data on unapproved (ITAR/EAR) servers. It's 2013 and there's got to be a simple, browser based way for engineers to collaboratively share & work with numbers. Emailing spreadsheets, clunky webpages or complex 3rd party models can't be the only options.