Try Visual Paradigm Online (VP Online). It is an online drawing software with support to PERT Chart and other diagrams such as BPD, ERD UML, flowchart and organization chart. You can easily draw PERT Chart through the simple, intuitive UML editor.
Develop PERT Chart from Structure Task List
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Develop PERT Chart from Structure Task List(EN)
| 從結構任務列表開發PERT圖(TW)
| 从结构任务列表开发PERT图(CN)
