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PlantUml is a simple, handy component designed to enable developers to quickly create some UML diagram using a simple textual description language. PlantUml sports a clean and intuitive layout that offers only a few configuration settings to tinker with. The tool gives you the possibility to insert the description language in a dedicated pane, or import data from the following file formats: JAVA, HTML, C, CPP, Y, plain text, and others. PlantUml offers an intuitive layout for helping users design UML diagrams via a description language. Of course, if you are not accustomed with writing description language statements, then it may prove to be pretty difficult to carry out the process.

Basically you can use this tool to write: sequence diagram, use case diagram, class diagram, activity diagram, component diagram.

PlantUML is a component that allows to quickly write :

sequence diagram,
use case diagram,
class diagram,
activity diagram,
component diagram,
state diagram
object diagram

Diagrams are defined using a simple and intuitive language.