Canonical is looking for developers of standard applications.

Ubuntu Phone, Canonical’s mobile operating system, is currently under development. Canonical appeals to the community to help develop standard Ubuntu mobile apps.

Applications that are waiting for their authors:
File manager
The calendar
Clock / Alarm
Weather
Terminal
Calculator
E-mail client
Document editor

As well as applications focused on working with web services:
YouTube
Twitter
Facebook
RSS reader

Interested developers need to contact Canonical in order to gain access to draft layouts for applications.
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A detailed description of the applications you need to create can be read in Ubuntu.Wiki .