You find my favorites apps for Real Estate on this page. Many have more uses than Just Real Estate.
First on my list is Docusign Ink it is free and has many uses other than real estate. Take a look at this short Video from YouTube it is an App you will want
The next app is not so much for Real Estate as it is for everyday use. Dropbox is one the many cloud serves out there now but in my opion it is one of the best. Here is a great video to show you how it Works.
Here are 4 Killer Tricks for Dropbox
I hope you enjoy these apps as the work well with either Iphone or Android