Try Visual Paradigm Online (VP Online). It is an online drawing software with support to Package Diagram and other diagrams such as BPD, ERD UML, flowchart and organization chart. You can easily draw Package Diagram through the simple, intuitive UML editor.
Package Diagram: Online Shopping Example
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Package Diagram: Online Shopping Example(EN)
| 包裝圖：網上購物示例(TW)
| 包装图：网上购物示例(CN)
