Google Sheets is my primary tool for managing a large index fund portfolio spanning multiple accounts at several institutions.

I am writing an upgrade handbook that covers the important deprecations and new features in detail: http://www.upgradingtorails4.com/

This seems to be really similar to https://github.com/highgroove/grocer ... but grocer may even do more as far as I can tell (feedback API and fake test server).

Houston is still early in development. It will soon be adding an extensible, Rack-mountable webservice to manage device registration, and perhaps eventually support for Android or other platforms.

Cool! I'm intrigued to see what happens with the Rack-mountable web service especially.