Webmaker App is a mobile web app that allows users to create their own mobile apps. It is designed to be installed in Firefox OS and (later) Android, but you can run it in desktop Firefox or Chrome to develop/contribute.
Please refer to our documentation at http://webmaker-mobile-guide.mofodev.net.
Mozilla Webmaker is all about building a new generation of digital creators and webmakers, giving people the tools and skills they need to move from using the web to actively making the web. To this end, the Webmaker App is an entry point to the Webmaker community that provides a radically simple interface for creating mobile application directly on device. In conjunction with our ongoing device launches for Firefox OS, our goal is to enable users in developing markets such as Bangladesh, India, and Kenya to engage in the creation and sharing of applications that enrich their lives.