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Modelio - Modelio is an open source modeling tool supporting natively UML, BPMN and model exchange with XMI.
Pencil Project - Single-user mockup / wireframing / diagramming tool
Diagramo - Diagramo is an online flowchart software - diagrams (create, edit and share)
draw.io - Online diagramming application
ARIS Express - ARIS Express is based on the proven ARIS methodology and industry standards.
LibreOffice - Draw - Draw, LibreOffice, ODF, open standards, creative software, vector drawing