Software Ideas Modeler is a lightweight and strong tool for the creating UML diagrams and some others. Software Ideas Modeler is freeware (for non-commercial use). Commercial user can buy a license and so support the further development of this application.

Software Ideas Modeler Features:
1. Fast and easy drawing of diagrams
2. All 14 types of UML diagrams
3. 8 types of other diagrams (Data Flow, Flowchart, Mixed, CRC, Robustness, Requirement, UI, ERD)
4. Diagram styling
5. Export to EMF, WMF, SVG, PNG, PDF
6. Import from XMI, database, assemblies
7. Source code generation (C++, C#, Java, PHP, Ruby, SQL DDL, VB.NET, VB6)
8. Documentation generation (PDF, RTF)
9. Simple task management

The license of this software is Freeware, you can free download and free use this flowchart & diagram software.