>Hi guys.
>
>In this oportunity I want to know if anyone of you can help me to find a good open-source tool that allow me to create, design and develop an app. The tool is to be use in Linux.
>
>Any tip, please?
>
>Regards.

If you mean a UML tool, check out ArgoUML at http://argouml.tigris.org/ It is Java-based and produces Java code. It should work in Linux.