Visual Paradigm for UML (VP-UML) is a UML design tool and UML CASE
tool designed to aid software development. VP-UML supports key
industry standards such as Unified Modeling Language (UML), SysML,
BPMN, XMI, etc. It offers complete toolset software development
teams need for requirements capturing, software planning, test
planning, class modeling, data modeling, and etc.

The application provides the community edition, limited to
one diagram per diagram type in each project, and all the diagrams
and documentations generated from the Community Edition will show
a small Visual Paradigm logo at the top left corner.

WWW: http://www.visual-paradigm.com/product/vpuml/