Redis is a highly scalable key/value store. Its an amazing server that powers many platforms. I wanted to build easy to use and great looking app for command references. Quickly you can navigate by category command that you need and review overview, parameters, return types, and of course examples. I used ACS cloud to store bookmarks, as well as each device represents an ACS user allowing to see your own bookmarks on your devices.
To enter "manually" command information , i built ruby on rails app that i deployed on RedHat's OpenShift platform and stored data in MongoDB as documents.
This application works offline which is always important to keep in mind. Ipad and Iphone 3+ , Iphone 5 are supported.