Top Alternatives to Umbrello

Lucidchart is a web-based application to draw diagrams.

draw.io is free online diagram software for making flowcharts, process diagrams, etc

Dia is free and open source drawing software.

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

Microsoft Visio (formerly Microsoft Office Visio) is a diagramming and vector graphics application and is part of the Microsoft Office family.

OmniGraffle is a diagramming and digital illustration application for macOS and iOS.

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

StarUML is an opensource UML tool.

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

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

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

Software Ideas Modeler is a CASE and an UML tool.

VisiTouch helps you view and convert to PDF your MS Visio diagrams for iPhone.

ProcessMaker is an Open source web-based workflow software and Business Process Management software.

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

Nevron Draw is a software for creating flowcharts and diagrams.

Diagrammix is a tool for efficiently building attractive diagrams and flowcharts.

Modelio is an Open Source UML tool.

WhiteStarUML is a UML modeling tool.