Lucidchart is a web-based application to draw diagrams.

yEd is a free general-purpose diagramming program with a multi-document interface.

PlantUML is an open-source tool allowing users to create UML diagrams from a plain text language.

Edraw Max is comprehensive mind mapping and planning tool network diagrams, floor plans, workflow diagrams, business charts, and engineering diagrams.

Visual Paradigm (VP-UML) is a UML CASE Tool.

Astah Community is a free software design tool which supports the latest UML diagrams.

Dia is free and open source drawing software.

Creately is a collaborative diagramming and design software used by teams around the world to communicate more effectively.

ArgoUML is an UML diagramming application written in Java and released under the open-source Eclipse Public License.

UMLet is an open-source Java-based UML tool designed for teaching the Unified Modeling Language and for quickly creating UML diagrams.

ProcessOn is an easy-to-use, free and powerful online diagram designer which support to share and real-time collaboration.

Modelio is an Open Source UML tool.