What are the best mobile applications for entrepreneurs in the Middle East?

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the diamond mobile application.
it makes you be in full control of your finances, paybills and transfer money with ease.

DropBox is a great app that allows us to access our files anywhere anytime.
Skype also essential.
calls, video calls and instant messages for free or low rates

zillo is a very good app to communicate within a team evernote dropbox of course any email client is necessary