UML Diagrams

PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.

Open Source

Create diagrams and visualizations using text and code.

Open Source

An easy solution to create product flows.

A graphical editor for dot files for use with GraphViz to generate diagrams.

Perl application to draw ASCII diagrams in a simple, modern graphical interface.

Java command-line tool to convert ASCII diagrams to bitmaps.

LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.

Generate sequence diagrams and flowcharts at lightning speed.

Draw SVG flow charts from simple text representations of the diagrams.

The C4 model for visualising software architecture. Context, Containers, Components, and Code.

Open Source

Interactive system architecture diagrams for cloud, software, platform, and security engineers

freemium

Astah is a software design tool which supports UML, ERD, DFD, Flowchart, Mindmap and more.

paid Free Trial $11.99 / Monthly

Online diagramming application

Open Source